Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece5cba50c25915d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 16:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33085d64703381c9c81e01dfe5d7a07f SHA-1: 325365bce88a30196534c04843364bbc825a10b8 SHA-256: ece5cba50c25915d78e4adbdf084c72032994e15f0fd0e53be98d0da86155509
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 point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing sites. The primary attack pattern observed is the use of a malicious link within the PDF to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a435e36fe2c015cd80265256da360b0d/lonufilab.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6cceaa73c---57174765909.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e7ec28f162d6208924346a9002a760f2/pevajumepimamat.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/gifq9ibk8222k522ef1ejo1s3s/83667259355.pdf
    • https://dienlanhhonganh.com/images/pic/file/wuzilezojakuxadukas.pdf
    • https://greenfins-thailand.org/uploads/file/gidikobipenerorufiko.pdf
    • http://hugslock.com/app/webroot/img/files/kafozasipofiket.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35a1a467---jekovijakoriko.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7e5vt41n258k0d9cd30a284u7p/womelolulorazobep.pdf
    • http://silesiacapital.eu/data/file/megapobizibilitude.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285078e49a---vepet.pdf
    • http://xycrusher.com/d/files/nukipuripuzinemitisuzeg.pdf
    • http://propack-th.com/image/upload/File/60492571679.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da03637877d---14098786812.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5956cd003f215481306b4802b25377ae/46020079193.pdf
    • http://studioarchperissinotto.eu/userfiles/files/72056208027.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/felotawajexekodekogo.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067ba7b7296---bewolubebususek.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/12650323232.pdf
    • https://hgb.se/filer/file/sutifiwonaz.pdf
    • http://feach.ie/images/uploads/file/ligukobane.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea4aacf7a8---ximurexafebipaxolud.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/kdbiirecko3sgdm08bniolirqg/15988303003.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fc0161df1a078ad491ca7a6b5cd5b445/99908989121.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=walking+in+the+jungle+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a7.bin
69fc1e3c8222ffcaad512e2b72b5faedcef80b64a8a9bc977859cfadd083f9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A7 10788 bytes
font_01_sfnt_off0000d973.bin
21fb5138766d1f94247080c009b43feed58f96389be548a7261f17fab987978a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 17548 bytes
font_02_sfnt_off00010771.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16792 bytes