Malicious PDF — malware analysis report

Static analysis result for SHA-256 a939b506c08e804f…

MALICIOUS

PDF

76.2 KB Created: 2021-06-26 03:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cd7c0dc1e0e6dc27ee6ba9e963cec58 SHA-1: cde90bbab3da930619484f95a542480c68def590 SHA-256: a939b506c08e804ff4b69642d65119328fb29697ef6f5aca79067d8164905027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or link-farming attack pattern. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://thedewakohchang.com/image/upload/File/1498015367.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b373cd560d9bc86bf12efa94d325df78/95232280578.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/marogeze.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6v89klp68f4cflcesjn0f949e/solexijegoruwofule.pdf
    • http://apcmagon.com/userfiles/rorekulajefotuz.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/60104479986.pdf
    • https://ancoraeducacion.com/images/pokujigapesa.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/6ce4bc45e32e020229e64d813bb1409e/pazewevukunesijiv.pdf
    • https://confetti-seasons.ru/upload/files/lesax.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607546eb36777---67804606964.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb742afccb---guzido.pdf
    • http://michellesmithscott.com/clients/36670/File/julojo.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1940242a9---figukujejalabizozere.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c9ab90fe6fbba0760ecd20db14ae1905/79152722403.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/niwizozejawixokisuxupufa.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e9ea67d6---mopevogopal.pdf
    • http://digifast.cz/userfiles/56044715400.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ggco93i23q1v7ijjv5pjnbs3qa/sapesoliwezenanabuliteger.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ai5dlhqpikg9s5qga1cq9th9v5/30016431759.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/080148a7fedd97701e4f59b7520334a5/64573022933.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/kipewekejovivasi.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4163667ee77a49e99303e0ff27475b02/wejadugora.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=charleston+county+probate+court+forms
    • 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_off0000c6a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 16792 bytes
font_01_sfnt_off0000deb7.bin
0acf19e587f6414427fcdaed9fab068c9c9b0329cfa5a642b81389aa2ba44a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 11036 bytes
font_02_sfnt_off0000f813.bin
2a02cf1bce2277fe48eb9ebf85d4ab4b899f4ee0c8baa4a9899bfdb4bec578aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 16788 bytes