Malicious PDF — malware analysis report

Static analysis result for SHA-256 a001bf8879966979…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 18:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5929e955d7202994cf23aec5af430a3 SHA-1: f38ae5d34a0fe0118f5f65a883276e1e813f7ccd SHA-256: a001bf8879966979a5bb9c98ec2715eb42e56c09656e25044a035e15fe312e53
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=how+to+transfer+files+to+your+phone PDF link annotation
    • https://tskrea.com/userfiles/file/31977481956.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/19838477456.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/64713652198.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/777226b5f5ffdd9b5bae2b393af4d4da/53013020005.pdfIn PDF document text
    • http://surausa.com/uploads/files/jemasilitojos.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/lexejufibasaritivofipe.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f6f3d31a---10900111998.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/89368559287.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613801134fe24---penemekop.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f24419f05beb8d0c905d0f52664b5467/62746416041.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/98495120602.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/99721186944.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/zuworafade.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/pifafopezeropuxokelogaze.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/94826522534.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/55809132276.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/93373505569.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/71cee0b6a445560eb0879203e05a2f40/73774729603.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/36681498854.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/ketefasigakukovazenud.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fcbcb50b1c38309597ce07f8324da222/felub.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9de51307---mutojomepuxanisipe.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/remitavotagevedalidotiwut.pdfIn PDF document text
    • https://losungversorger.com/product/file/30285777978.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/60844053035.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/28235950331.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/83234478441.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/87525800669.pdfIn PDF document text
    • 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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 10748 bytes
SHA-256: 49fa887fd8f5ae96e8dbd7918cdbaacdc61cd4e2f48bcbc6733862cc327c113b
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 16888 bytes
SHA-256: 502fd42c751cdb2ea9977f01425c6796599566dcb0c3228668858cc3bd20fcae

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