Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0b21ff771ad880…

MALICIOUS

PDF

97.2 KB Created: 2021-05-22 23:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8066469fdb75550834ecb55b88eebeab SHA-1: 2e8399ccae87040f13b6680c8836a602d026c7ce SHA-256: 6f0b21ff771ad880297beae5a2dc5d5a92305f62f345bfac053f24b0363fe10b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16080dffea93c8---laxivix.pdf
    • https://abofahed.com/userfiles/file/xepuwemomagoxixivotumo.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/mqala2v3060a7n42hqj8b7sc05/zesulup.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c6d1798763a973854d4b9e56ef68e18e/49058422488.pdf
    • https://abugfreemind.com/userfiles/file/davenavu.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/678b7406a7218cad4949b0d4f39c46a6/nijasokujufemodo.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5bqb73ui74s9llt3f1oqg2lgov/72331533250.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/833f3a8ce9476e80dcf07e1bba7614c4/38219174916.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fcae60fb---53613123876.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070889c2e7af---15173855971.pdf
    • http://pwr-tech.ru/userfiles/file/resig.pdf
    • http://adria-ex.com/images/blog//file/gosebujesesas.pdf
    • http://armanetti.com/images/netinokowakavenasaleki.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6481d44f9ed43a9006e3142527a6060a/vogifewekuzaxogikajili.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffa41eda1---72464028717.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t13aank2urredb6sqhsto00o9f/85656068526.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mpsaodd6v5h80cs1v49aacqfup/13968159126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=iron+jawed+angels+active+viewing+guide+answers
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131e5.bin
952e1c899e71dadf53abdc2a6a92519752891e7255e7e6821ed66ff27fc3568e
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 5152 bytes
font_01_sfnt_off00014390.bin
a5f9c7b7509e190e50f613541042ff088499cb6fe93ee53b8e68f72612f0e5e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 11132 bytes
font_02_sfnt_off000168ea.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x168EA 4324 bytes