Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b27337cc533faa5…

MALICIOUS

PDF

94.1 KB Created: 2021-07-13 19:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bbdcbdf65dd5ef99054250c601fef41 SHA-1: 8fd381d8aefd8ecf47d1f54495b6e31277549e6b SHA-256: 3b27337cc533faa5a51f80cf717c08224d2a0966b097efe9a8a596e08c539753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm likely used to host malicious content or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd662566e3---lojukediwa.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c914972dad4---77130890268.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/73475083634.pdf
    • http://naturallabs.de/userfiles/file/dijukaweka.pdf
    • http://simonhoirup.dk/userfiles/file/42223209819.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/84e225ba7a037068f1e802316be17f9d/mofawibapulobamumum.pdf
    • http://domholidays.com/userfiles/file/runewosaverawujogiv.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba625e7ef---32931790980.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d23c48711a0---48864182950.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/gogevodivagawumajefo.pdf
    • https://stdtekstil.com/upload/ckfinder/files/13633294305.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/rarevikamo.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/46388461857.pdf
    • http://vattucongtrinh.com/userfiles/file/bofesedupilatoja.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607904fb29459---dukunegepimitix.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5rr95vrkqnsrbg5aiqrjfi4u57/12692170311.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160937f667243c---jovemufefa.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96348530762.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81da531ea---fumutoragav.pdf
    • http://agcslohian.com/userfiles/file/20316835777.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902fc15f5cd---83558751055.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b967a86654909994bb9e484241f883bd/rakelila.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/83425620352.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+exact+value+of+trig+expressions
    • 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_off00010c3c.bin
5fc40a8ace2aa03eb71eed5a68ae07f9bbebdd0c427d655ca4010bc96064d55a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 11140 bytes
font_01_sfnt_off0001262f.bin
19e602246e82f8c680f1873a0cf0782d6710253624ad254c618693e650f5865a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 17020 bytes
font_02_sfnt_off000152bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152BB 16792 bytes