Malicious PDF — malware analysis report

Static analysis result for SHA-256 246e08d1871a7ae7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 21:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6e2cdedc297cb7cadad70443784eda52 SHA-1: 2c16c0547312736dad82b20c86eab0141f9ca1d9 SHA-256: 246e08d1871a7ae708bb0f463ccccfded26e7e632bc4bdb160f6f65817cd0d8b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://hondatayho.top/img-ngocbao/files/sigefep.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ppdlbpsi1b8r14oh8jeismvd6i/xilepexak.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/54147618870.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/93976615435.pdfIn PDF document text
    • https://777mto.com/contents/files/newavilojekub.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/58930257222.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/15484681041.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/43149851555.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/ximegukefiz.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656dfcd6ee---19859231990.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/90286139109.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cb9306d27824152b80db6da3a853d256/41484117881.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/zoduvupesoxoxexa.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/529670112.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/wasejubiwokowanisofinipon.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139067074001---vipatuvinunebagunat.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/88315751597.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/neziniwoxowebuv.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mibapedebinexufa.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/40821898948.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/molejotulemomigireji.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/filifokenexeribijeguwep.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/wefewor.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/dugodotegimu.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/97993351215.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/e4foiu558sh3g65kc656uv4l57/jaxuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=paypal+money+adder+for+android+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB971 16200 bytes
SHA-256: 664c885a6298f859a846a5dc17f14cc6db48c27dea59beda66061f5c2c054861
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 10600 bytes
SHA-256: 5abfb87ae514635dc6deccdc57d72ad4a32ae26ec3275b5effe7b7715f784e46
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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