Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6f11f689c393e5…

MALICIOUS

PDF

81.8 KB Created: 2021-10-04 21:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 6bbd1ee9b3b6978ff684ee9a47d89b6f SHA-1: 9b1978747ba39ccf4ae4fea0e887a6dce5a80dd8 SHA-256: 9b6f11f689c393e5c0e5f625dd9dfb13408037ca836a6820033b5488f531ef93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://obermeyer-modemarkt.de/upload/file/9950467567.pdf In PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/ruridavupupur.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/lofunokipopeladi.pdfIn PDF document text
    • https://guitarenko.fr/img/files/jejumeziweburozu.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vubesojuxejelorokevoxu.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/80075091895.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/15693867695.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/welawigizakumedunaseji.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210909205719649.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f267cb6681---jidisudagar.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/22752262109.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xesot.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/zavalelirevi.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zabinaxidegogebase.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/64558933422.pdfIn PDF document text
    • http://donghotam.com/luutru/files/88317282362.pdfIn PDF document text
    • https://epiphanych.com/images/file/88654343261.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/8432197863.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bigawedaga.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93dkg47qj3lii27f6o52kulciq/29158477382.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/99556266712.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614241e97f1cb---32309316450.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jexamanoma.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1c5aaa1c7c648368fda1a824e8667165/noxunezasetexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=spear+meaning+in+teluguPDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 10484 bytes
SHA-256: 9af8362399a87ccdd30ec7ced9b1a33bfcaf8c3250962f55e4ffcb62a08c67d4
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 19404 bytes
SHA-256: 0be73c9a15710feb225b156538f1ccb2ed7baf74384c4ba93af6e6e3ea5ab79d
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1