Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d38f6ad44ef8cc5…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 00:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa2182bab61689645830bca509c27c2c SHA-1: b580ace73d82c5530d54d6bceb24a7329d8e7f57 SHA-256: 6d38f6ad44ef8cc53aa48a1810c95cb95e66d9629f2ca5c2c5b8c79c41cd564f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b0a9102a9cc196778c8191cf44726a1f/34138884197.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0gim3s5ve4udp9gpsh7gl3uggd/jejoxetulowajuvobaxabogu.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/tugefesifokovove.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c204264db---leminovedatowotikulurew.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdf
    • https://soudurelauziere.com/upload/editor/file/74268556805.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0957e9036---lefus.pdf
    • https://salvatoredivilio.it/userfiles/file/juperewuzunofepurez.pdf
    • https://africanresearchcenter.com/userfiles/file/22734240438.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60B2682BEA372.pdf
    • http://traktorpulling.de/ablage/userfiles/files/17394636320.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/lamatuxekakep.pdf
    • http://abpaluso.com/upload/file/xubadezakobubatakexanavu.pdf
    • http://chiengthai.com/file_media/file_image/file/tuwuvomuvovesolasanag.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8d699e5c---famajefegazow.pdf
    • http://runo34.ru/attachments/file/72403457319.pdf
    • https://digireg.org/upload/84648729880.pdf
    • https://angelsstaff.com/uploads/file/dezufofujegenefov.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607440c08e8cc---riketuxupezis.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd77d0f20d---jamogid.pdf
    • https://stopserv.ru/files/file/36866650299.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f076167be---kekigofarig.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f03uejflbs143t3plhbfg0q1s1/23003254942.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c100bc6808d---minuxojezagirafofenitapaj.pdf
    • http://villa-carlshorst.de/sites/default/files/file/96904286443.pdf
    • http://llux.vn/uploads/files/luwukegizudotinaletuko.pdf
    • https://asset-books.com/userfiles/file/mebadowolepasibewe.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d837cdc0a---tojer.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=small+deals+outlet+cayman
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96d.bin
61e5d11eda1e7abef8be6e72ccb4a423b277ffef220287df6d1b35293e6cd758
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 10628 bytes
font_01_sfnt_off0000f1c6.bin
29119ebfe4e46c9e1af4dc02aaa1f780f4d37eeef77fb99a4462a250cbb133dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 17244 bytes
font_02_sfnt_off00010aea.bin
cc6a8b06ebb348e0ea43cab0ece86b695d6bbb0a0093c83240b0cca8d6363fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 17560 bytes
font_03_sfnt_off000138c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 16792 bytes