Malicious PDF — malware analysis report

Static analysis result for SHA-256 9217409c64e22fcf…

MALICIOUS

PDF

85.9 KB Created: 2021-08-12 20:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 501311ed512f459d9e29caaa087c9bd9 SHA-1: 7b66f13dfb917e69ffbe161d2d566472bb222184 SHA-256: 9217409c64e22fcfddb867ceda8ccef788c11d5a8e3d8e652cc939cb729e71f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lucann.com/Upload/file/sedinixonefekunig.pdf
    • https://bleikss.com/userfiles/file/56310718393.pdf
    • https://ms02bet.com/contents//files/19938491498.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092cea799b4d---resubinipet.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/juxofoniret.pdf
    • https://rent-1.es/ckfinder/userfiles/files/vufomurulibagejogexenu.pdf
    • http://goddesshair.net/upload/users/files/49127291888.pdf
    • http://centrons.com/uploaded/file/88647652060f0929d4755a.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/jewumapenadudizuxep.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/lefuzemojavejobigiziguxe.pdf
    • https://birudongker.com/contents//files/38119952882.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b56001852a---59999092398.pdf
    • http://stroi-sistema.ru/img/jimotimesaravuzufoku.pdf
    • http://ahchala.com/img/file/45215887169.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bgkipoch9hltmug2oqr2f2lq03/kiwurupa.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8e04a0fefd6d7262465e5036ec0fd657/pubepazimesu.pdf
    • http://ippon.lv/uploads/File/legokeminaporixejibenevu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160811fa9509b3---41597294759.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/71553858232.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/409530efbe4a200c0c6c7fe07963d7d5/dizeguboduven.pdf
    • http://viviapalermo.com/userfiles/files/legipexilovoduritatugojo.pdf
    • https://all-stage-meditation.tw/uploads/files/6114275031a8b.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+oceanography+job
    • 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_off0000ebaa.bin
75064d8af915d4254da6913450d0fc995209436fad75ee11958800a0fe96a7e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 10984 bytes
font_01_sfnt_off000104ef.bin
73168af88a3bb97a29a5c85a8f1e1c535e3a7bbe85654d410e5ec22659a7b2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 17436 bytes
font_02_sfnt_off000131fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 16792 bytes