Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a47d0d244870ee8…

MALICIOUS

PDF

88.7 KB Created: 2021-07-31 12:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91cb68eb7786da9b23a555288e284c1e SHA-1: 504418921fe8d6c3af6ec8b4cc872c609f0cf879 SHA-256: 5a47d0d244870ee8fc880b9801975085cd7ed48b96315ceb186e34b2de1f7521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to numerous external websites. Several of these links point to compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a951ab474---96934231736.pdf
    • https://nada70.org/userfiles/file/zosiliruguza.pdf
    • http://swaminarayangm.org/userfiles/file/21572507275.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5gkkktmpk25v5941dhkmksv2r8/76107631954.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3c3234a2---7995915145.pdf
    • http://ahlhy.com/uploads/file/271454406102.pdf
    • https://bednidhitraders.com/userfiles/file/xoraxunamux.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b4f5a75a---75281542941.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cbedcd030---5189957401.pdf
    • https://lose-weight.tw/upload/files/ralopevutupasopivukusore.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205481cce1---sobotagob.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/tevoderibi.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0b11695b8803c77aff9806426b4ab0b6/lusexalelelit.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c1414a72---42036475842.pdf
    • http://menafundinfo.com/userfiles/file/87406361925.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564249bf7f---49551777915.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160862ab77653b---diwidowej.pdf
    • http://patrick-vallot.com/upload/files/limifegom.pdf
    • https://chrmglobal.com/userfiles/file/76279737348.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/caa045fed032133674c44b0cf2c47d21/62833099505.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d2a2635d---bodibupefukikep.pdf
    • https://didacostruzioni.it/userfiles/file/fefulumivoxelunefisi.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e825498127---weremubasu.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0850aec506---94056887044.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/60987711934.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=animales+para+colorear+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
font_01_sfnt_off00010dc5.bin
05481994d115ec23e74d25bf636652453691205d7fd507bb1522fc8fae701cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 10664 bytes
font_02_sfnt_off0001261e.bin
1671002becd7c05099360c455c639caf9df12f22074ea3dc7ecc4e5dae91c0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 18696 bytes