Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b5e26babaf4b16…

MALICIOUS

PDF

91.4 KB Created: 2021-07-19 07:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f4f22f764ee93075cae2b13a2743969 SHA-1: 604d98360fbbe50751fa6fc720f78f166c3a1259 SHA-256: e2b5e26babaf4b16fb6e25342cb8fe5eda2202b637f5f31f32e1a004db428605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links and the nature of the heuristics indicate an attempt to lure users to malicious or manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/99a956d6879ce5b8a1f319ec33a320c3/95130562493.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67f1e0f62---62060689273.pdfIn PDF document text
    • http://k1a.ru/images/files/file/65034824926.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/kqou7k22p842j05vt7akm79b83/65712028661.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c7b50e17f---mibawok.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/umtqjo858f9v2vkkqbp0ff500g/47566289133.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b8e10b5c4174a7da032f38e87bfe4259/42252310031.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d9a35f8bd0c00c60dfa6a5b470baa8a7/jaxufavegijowigarupexime.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/37632444019.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/61978466771.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/xegabo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/45203397886.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ddcaa22f---24771675066.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/40642926685.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc63fd99af1---16104973314.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/18929561929.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/fazigukelajamapekudato.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b242c504f11---dapulona.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xajotetezenotolozizagorak.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876f78daaab---55500030015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=baby+blue+nails+with+butterfliesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 10684 bytes
SHA-256: c0d0274f4646280369cac2c944f10a754cd5141b104ac693266651f2c4957974
font_02_sfnt_off000133d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 17196 bytes
SHA-256: cebf2ddb2e4c69df506b0b952afb4d2fa6a046eab19129ab35934de21ec1edc0

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