Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45d7ec28f7cbe5a…

MALICIOUS

PDF

66.7 KB Created: 2021-06-02 21:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff55efc63ea6d411dafd67b52fa90954 SHA-1: 0e00eefda375043acc55cf5acd0dc206555931dd SHA-256: e45d7ec28f7cbe5a0328ec641f597840c5745537f9f9e70bd4af6e9bed8231b2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nomylo.ru/uplcv?utm_term=comentario+biblico+adventista+tomo+3+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ns1d4tiedkcsac675u6ofbbg6o/69733692968.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099be5ba2ed8---7687716581.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d95a483e4---lekamidejimen.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/forola.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/klfmsnm5g0u9r51e2vscsue9op/22805092378.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/21628865625.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700c8e4a90---94469549715.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xusesuwisogenuvelu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba1345096---rofojoxerabasusuvapim.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efa66905684be562065fb0b4153150c7/59747178446.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba8ab5c5a---falepojigolegovitabusoji.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/93f67f2fb380954025d5513d8ea734c0/mexegajexixirepofifupin.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45883583921.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608f680f98c40---majovopamulebogetolobi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6757e8da---navisokebopavamarevim.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706d403c71f---geguxulojatokapatapi.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/gifamivepatarid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 5568 bytes
SHA-256: 064035f9822d80e2f65fdcad95e0b2422ff17876f8f3f70c8b0010d0170d2426
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 11268 bytes
SHA-256: 17434c83061ae40633451f1d30c82eeaf29ad45dc3395539eb1668a1ea6d86c2

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