Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e89634109e683a1…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 22:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2c13ac22b47547687d75c3d16e8e72e SHA-1: 09153c6b55655ccc3f095e0f9caa326fc90706da SHA-256: 6e89634109e683a1f56ca49b36397759fb40152cef8f6c6dc6a2af2d8c65b60d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. The presence of numerous external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b286279a8a4---81888198819.pdf In PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2106180442317753668213b.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/buxetepiwufova.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fc7e622e4f8fa24b09a89c8829b284f1/dexoxiwu.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/vabifewezawesilukexupeko.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/904a8b89143bb9c0625ad6a27357d31c/fibosasijitexupog.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ff92ca1c568120ea8c93ee40f3f2dd0d/getuvipozote.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1561e3c5b2ae2460030173a699e7d0b8/puzufageg.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ft898csqrmof1lg5cna10122/kivarugubopebuvinejivuwam.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/gakatetejexixamam.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba4058981b281cf0faf2308314a5b4b0/146601892.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d99970df---bepoxalipolexazik.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3f30d4d3ecdcb7023dc486a9e1778ebb/mebupar.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/guwofujimarasajidodesuwis.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b92be3161---xadefovonogexe.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/12650664686.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/65220423732.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/74dd9ef1e62bb7409ee664c89051033f/nadowaruzoror.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4589d7762a02c99c195cd52539b558e5/27313541524.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607db092655d8---ludepesojawodufijo.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4htqb384h7irnrp2ev4gp0p4k4/3665523717.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b28ee839e916938c9ed5acb7b9332112/lugosonufegelalusikasov.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491f50f264---82837185642.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/2shsm6elk76045kca7ihd8jajp/37524132625.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/dce706bfa4eeb480eceea4605ae876b6/movifebewogi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a1325f84e5cc633d42edea3a0dc71b39/3225643635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=upsee+old+question+papersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 17052 bytes
SHA-256: bed589eb1d708765aaa7c5462ca1918c38b37d272f8a96dd074ec53f2f9e4824
font_01_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_03_sfnt_off00014db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB4 10640 bytes
SHA-256: b9654404cc2dae8a6f14b5b8bf8ebbfb7cedd9b4af3a76ff213db29968c2d007

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