Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3d1de95c6f7fa2…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 05:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 141b1a213a91222fbc98280bc2ee1edd SHA-1: 603dc83f7f6c3475653ffd4471e4365483a4763d SHA-256: 5c3d1de95c6f7fa2dde90fa10a445a5c2e52141da238615307e2de89190780b7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm attack pattern.

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://drafthe.ru/uplcv?utm_term=ielts+12+reading+test+7+answers PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/xuviwatoboroxanumote.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe96881bf3---pojodejativejojesejef.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/23003865422.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/66867060939.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/nofajesewurafakumop.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/97ae9d62ff554a14531dfd1633f919fa/jupibizimiwupemogizu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210902132940.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/70724105485.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/10870105552.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/63612761500.pdfIn PDF document text
    • https://mytopics.it/uploads/file/rofodizavujemuguzisupe.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/lejutu.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/gepineliponokipawete.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/22067027537.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zugiluguzojope.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/7028380767.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615857419eefa---97649152211.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/kujob.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tk0rrfio0fablj2vrdb8901qo4/21191919057.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/vobigonifa.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/zelibi.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/5692836759.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/wakufaluxivagesixamefig.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/kuronukirekuguwabur.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/kuxegegasimalube.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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 18628 bytes
SHA-256: aef6bc8cd18cef6ecf478a4c63e22514236786366bf97555234c2b6d9936670e
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10560 bytes
SHA-256: 808c4df979944a0edd388cc524691c8e7b46fb3f083850774504289c03d64e77