Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3454c3f2aeb719…

MALICIOUS

PDF

67.6 KB Created: 2021-05-25 16:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13c8c4d2dfe3840f398524ad82768b0 SHA-1: e966f36e26f90f25531edc95c681542f5e9e5559 SHA-256: 4a3454c3f2aeb71933a22385819a72f181f4f32ec881dfd2e2f35381daee19ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8569

Heuristics 5

  • 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
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735bd604cc9---sorune.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/778f3a367e457179930410adba932934/wevimutazefesogog.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/484d1e8a8cb4bc6f497b62c1eba3c998/getijamuvinun.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d067eab6e---27302862514.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6e8c2239---gukizupezox.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/299c4f882410bacb619cb3e6d90d8e66/10690405813.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48d7a871c---23882549356.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0d98c2df---98848447833.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de53631c4e03a71037b6bdcf49868977/fedekefepiwu.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2b1e25d93e223f48406a43b939a8b8df/pexesemilegivonaza.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160799a77ccd31---18478032795.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b5195b1b17768f3bbef3fefbd533a429/kobuxoxiju.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5e4b4dea1e131c4e37d8be906a6e1431/60865114277.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a8036c5c6---lobeximirudifevuvinito.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2688e49b3d670b2f97aba2dc1b6bd4ea/94217685713.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766df0446ee---xumoxoxunikuwositivejus.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5eea2550f---21031089459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+sub+to+vizio+sound+bar
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd30.bin
8d1061a363a6c2183d70bca51c1a6be537e821885988aa3ebfa08abcf17dbd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5204 bytes
font_01_sfnt_off0000ef0b.bin
bc325d094a89066f3bf1d56232ebb38179a63e4aa02fc5ab565c20adfcfa2f7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10392 bytes

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