Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8b1445a46cab3d…

MALICIOUS

PDF

71.1 KB Created: 2021-06-27 22:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d0113af36a0167bf9427602e82a91b2 SHA-1: 6ce2120beb9996356c575b2e620cd5e212fb97d8 SHA-256: 6a8b1445a46cab3d0bdd27604c1bb2284f1143ac5957841f4c52ddb41ddfa377
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=relative+risk+and+odds+ratio+calculator
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc2a0e0ab---38319523767.pdf
    • https://webtechnocrats.com/upload/file/sesasodulipas.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607256f53f77f---96966517366.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857feae0fa---17133626328.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608576e00c20e---kadesinukotemenitir.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/15901cf35f92631e9b3a2852fc6b3be1/kuxeburofomesi.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1b496d92ddfd6943c3806e75f142a328/sekixepazarakulufo.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ad701942.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d09b71362fc---31324901354.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/sub8i957pirep36c0ol1rm3ho0/97310720766.pdf
    • http://hurtowniagrafit.pl/userfiles/file/mudojosowowapijezavubalo.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2550423348---dawag.pdf
    • http://casavacanzesanvito.eu/userfiles/files/93846572282.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5fd5f04---wakireximemo.pdf
    • http://51-lq.com/userfiles/file///25551178147.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/28c9cf30596c4371aef06ec0e64f2f4a/dojosox.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cf9a62fe---65397908492.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2868dc995c40c9658f880d7c1b75875f/karotofarunuvutewejibu.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2e0b07239c7d957b50b8bad6fdc19bb3/94192003765.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/muv6aio4cbisi034s89ob1s6h1/62959687225.pdf
    • https://samarpanbharat.org/trila/userfiles/file/72643376463.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc99ee4536---92668695010.pdf
    • http://bright-mineral.com/uploadfile/file/2021061102591023.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7fa251355d6a6edb39f779e381372040/sorakovepixoremew.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_off0000b7c8.bin
5812c93a0584dfbd391e57daf5526881663f848ace92196fd5f39626ac440f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C8 10664 bytes
font_01_sfnt_off0000d061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 16792 bytes
font_02_sfnt_off0000e873.bin
d6b726ad22ee315b040c679a7900ba5f7fcee206a7e2ee2b5fcab96c1b07417e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 14916 bytes

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