Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8b454a78a43198…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 02:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 940031bd18209d8bbb2648d8fa6fa6f7 SHA-1: 041cb1e879d0ffb23c8251a019c629c7c3e1636e SHA-256: 4d8b454a78a431983e1006f75b6590c7fe57bd45bf050e3e2d9676df65a0ca73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. It contains numerous links to potentially compromised websites and is structured as a link farm, suggesting an attempt to distribute malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or fraudulent billing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gonzagafood.com/userfiles/files/mufamalomubikelotusirirom.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ff0807ef---rilosuw.pdf
    • http://finalbrand.cz/upload/file/gukugifab.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700c77f26cd---kufivojapawewu.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/gedifosin.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d57addb99fb0efad7e347a3be44466c9/kuxufatovabekud.pdf
    • http://yongqingtech.com/d/files/fogum.pdf
    • http://reutlinger.pl/userfiles/file/tovananurenexeroneduna.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954e440776e---xevab.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/ffaaf560ad6c885f92a6cd08c4bfda5c/53864573507.pdf
    • http://didongsinhvien.com/upload/files/62386038165.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c34626a5---36006237164.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ecd9e984d---81471836963.pdf
    • https://factinet.com/uploads/files/27870970764.pdf
    • https://wolfgang-photography.com/userfiles/files/49937489171.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/54gov0fv0glupcbh2uim9hqbgu/matekekawesikixijodej.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/gupavumexurokazukivakosa.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/67472bbe0697a0d0c73aa48e7cf4a48f/lerulijulag.pdf
    • http://ingpoggi.eu/userfiles/files/54552500894.pdf
    • http://www.jokilaaksonratsastajat.fi/file/gogorufabovig.pdf
    • http://eshop-kocicinadeje.cz/files/file/43962334432.pdf
    • http://angarakshaksecurity.com/userfiles/file/benetupel.pdf
    • https://espritgt.com/userfiles/file/muwiwuwisepadanobobi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anabolisme+catabolisme+pdf
    • 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_off0000b61b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB61B 16792 bytes
font_01_sfnt_off0000ce2d.bin
78ad94367fe89d48aa1583bfd7aa92485203e96321fda319621131112ca87c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 16108 bytes
font_02_sfnt_off0000f6d8.bin
21105939ea8478e69490bb24fac2ee27454bab3e3d94de142c092e1891391754
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 10800 bytes