Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f392c0161636728…

MALICIOUS

PDF

88.2 KB Created: 2021-08-10 04:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00cc609c4f1a26b1cc2106aeaecb61ea SHA-1: 6f54d1082182a7511f95315da1f7c4d9bc60444d SHA-256: 7f392c0161636728d693202850aeda699ae8e38eb2b7af1622e22541e8a5f313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains, indicating its purpose is to act as a link farm for malicious redirects. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=beyblade+burst+evolution+episode+2+english+sub PDF link annotation
    • https://relans-nn.ru/images/docs/file/badep.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/23675193227.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/336fe27e9c0a289bf11252d3f2fc09fb/bopajefix.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1ab3da6e9---53297700744.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/vufizikepanonu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c83d898---5766015843.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2220ada99---javavato.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f813c72a50f---20449685619.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/58194506379.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160817ba340a51---752363637.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ab777c4dda25223f6d909622fc2fad2b/2070008995.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ef2ghi7r71pdk39um1s7ob5ulm/18402545339.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/durawolar.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074465633c23---56385055696.pdfIn PDF document text
    • http://mrybalko.ru/files/93522971592.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160830b6a29c70---nozadabaso.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/a8hvnqi1a5vc3u6kf5e6b15qse/26634677548.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/3943681682.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ufr8ineph0p1773onljpscc2ie/luvovinamole.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/zigafefa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160943c34b2bed---sumijanabadulurozu.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/20614541373.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 11264 bytes
SHA-256: 2282430e66b45a67ed0345f314b225de8b8f221b26bc4c1c051bfa42ed75e090
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 17084 bytes
SHA-256: dce1ed78c798edda36e1bc0a7000cc5ad7c10e455e7140287e2edf7be1b5a858
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 3072 bytes
SHA-256: 80257624e8a30fe1cc9f7a10b7c33d9ff766f585ec63a26ae48a833b5f90b988
font_03_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 16680 bytes
SHA-256: 9d7f842f431cea2e16910d6770151554261f03bf07739cebeb636f0063641530
font_04_sfnt_off0001389a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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