Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9833d41dc91720…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 16:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e69439d6de6f0877028a01fdab248b0 SHA-1: b75b13aedc92e57de10e1b7942471e7e51cb3941 SHA-256: 0d9833d41dc91720edfd38882e49c8e4e8904254e6e1c387183cc4896dca51cf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick users into calling a phone number, a common tactic in tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://crysiq.ru/uplcv?utm_term=probleme+activesync+windows+10+pro PDF link annotation
    • http://doorsatyrau.com/ckfinder/userfiles/files/97241154181.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-04/images/files/kalimifuk.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/96156481495.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jboncjck8kjk2l07g0ijmsfp59/kevesobazajesapifikex.pdfIn PDF document text
    • http://jainfarms.com/uploads/67173945477.pdfIn PDF document text
    • http://cosyromania.com/media/file/libawedexokatolex.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/movabademida.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/65092564339.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/powupuwi.pdfIn PDF document text
    • http://4rrecycle.com/files/file/dafofebu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a375b8e191f---sufofog.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/59407232389.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b0e15a3d9fd95fccd74c52c1db171a2f/31799261335.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4185308f7783b2cead2faa88c6110a7b/23890544977.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac436230e7daf4e2a1510c3ba62de87e/loluniwikufovimapidupa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/prlfilb9gt7duobq25rj0bbp01/97420175087.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/tegoweda.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/8252375090.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5af0cdd55---12496352251.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/519ea7dfa2627bd6c6d215acbfae3143/loguxozesokupuxedakugi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a4c877566765c564a5ce1fbcd2a1f01d/16779188829.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gq0lcmdblovjesgss90crfregp/70438126056.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/78965059764.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/lusezodijakasefopo.pdfIn PDF document text
    • http://latexindia.comIn macro / runtime command snippet
    • 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_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 11256 bytes
SHA-256: 2cbc8d72ded94dfcfc8e70a596e4ca9d216cd83e347279717e3256e94acf2574
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 17160 bytes
SHA-256: 4377d4f80f3a71b2387737f917ffdb46cd3d0e1ec7dfb54625b5f5dcac00ff41

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