Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab255a7e7f0bb75…

MALICIOUS

PDF

90.5 KB Created: 2021-08-02 23:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a5dd55cbd039aefae7ecf1d3b39557f8 SHA-1: 652da167aa5ecc183d13907fbcac0988d2b7a1d9 SHA-256: 7ab255a7e7f0bb75e9a2a75f9e584125ce723faf91b1af70dfac390d7d517e0c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/faf5a805c7667a69a64d201101a4cf9a/71756496587.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pavamazaxekeporet.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/lakudapen.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e07b4f1a---96368311352.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kt06d4vqh5d353hvpjfqjre9t9/30032302793.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/61034786134.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/34259377239.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/331971634.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/petuxopubusanome.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef479d805---vetujekawikigujaxofebaxup.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///80934076165.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/de5bpjoeb177i699p3a5ckgnp3/60310249481.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/2c344569a54994c67ad31e20b48b24dc/butezadodez.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/93521271749.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-6/20210506154839315919.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/nixasomonofetajaver.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/75064131243.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3nck16fbr50pncdo0orjsnnm86/nomuxisexuv.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f90f4b3a4---tureni.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098477a4ff8b---miwudemevazozikonekurobi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/81542342679.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f011dd24efe5573b5712a0928b0046fe/95769568630.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/vukurixemutukuxisu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e71d8be3---34449397301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=japanese+kanji+made+easy+pdf+free+downloadPDF 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_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 19080 bytes
SHA-256: 507973054e78a8a9c2abfcbb499a2b06a6f79ae56ca9360f97495317ddbf0697
font_01_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 10972 bytes
SHA-256: dee705990977907149932e88d2898b4b70666843f1947b3d56aa5d2cd68af6d9