Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf28aef9eac7894f…

MALICIOUS

PDF

92.0 KB Created: 2021-07-19 08:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fdd71ff495f5361f49e390799baf610 SHA-1: 6daaca213a36be5152f5fb3ec9b21dc170f2b523 SHA-256: cf28aef9eac7894f38a0b01d395cc906f0f12d80c13cebe2193ffd80cb102017
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users through deceptive links and potentially exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://digifast.cz/userfiles/gigojajudegigun.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0e251834---14261292873.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06964a6a04---lolabubewadibef.pdf
    • http://mastrodibaglio.it/userfiles/files/mapixuvivelakaruk.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/356ppjfvfb9masc35j11ajifg5/gimiwite.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/60f774agvm49epda3n3h119aku/69013906214.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/27134e345f6773980fd2699d154b5f97/96853791568.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dd008150078cecc920c863e7e7557f9b/morokibunujekojoga.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/barotonedovemu.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kh3sqdgm0nhf2m19gb1tsajg17/memisezipo.pdf
    • http://cartonwrappingmachine.com/userfiles/file/92555802919.pdf
    • http://synerfreight.com/syner_upload/images/files/39136308529.pdf
    • https://adsbudget.net/userfiles/file/levezewewezu.pdf
    • http://nktrading.qa/file/files/fijavejemakutigiviget.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2d9de731ffb311b501f3a419260e37cf/84796266746.pdf
    • http://sztarmedia.hu/_user/file/sisokisokegemoles.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4218e00d8a3c35e22d776827e4d34f95/82197654929.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4898d5fabd996cb6c5d6de54bb8ad31e/80839637067.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8d81aef1659527f681effafaf15f1ce8/fivuziwitesapekiviz.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082233454683---2058440250.pdf
    • http://geotersrl.it/file/rukedafazasifisuve.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=another+cinderella+story+once+upon+a+song+full+movie+streaming
    • 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_off000102fa.bin
9c7ec076e14cfd98b0c1520125c20fb077d6a57cc4b2d0dd958dc02f20396db1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 17324 bytes
font_01_sfnt_off0001300a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 16792 bytes
font_02_sfnt_off00014821.bin
d7cd82b9789cae9b7ad04c555dedeb3e957f1fc199bc50810886cb5015a80699
pdf-font-stream PDF embedded font (sfnt) at offset 0x14821 11328 bytes