Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef1bdd73e3f8223…

MALICIOUS

PDF

79.5 KB Created: 2021-07-06 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11b304b2ad966b9296d8784058a54314 SHA-1: 6ffea607657b0dd55063fc0b4e3b5f5f17db2330 SHA-256: 1ef1bdd73e3f82235d15c8446ee3c5d126ceb74595d107cc836e58021947ce8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06af9219e---xalujedixezumowizibonube.pdf In PDF document text
    • http://dgjst.com/upfile/file/foveviwuxuvukixa.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/48661954048.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/14927152975.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5b3bce800a02fb4578848d4bcc7d6a99/3691571875.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/93985181398.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/55508144349.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f587ad0b0e87d8a0daf57a3293b1269d/96161364989.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/4898115271.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/17046871336.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/bumazesitanajatogazojuk.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160841da61e9b2---riwunegipi.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/533d639c6934453b95a822f9f1f38b10/dudumovivi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609195a261e19---35378236625.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/68442223929.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a550748d---64899571484.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2ffc0efa---wuriroxafubomo.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/vuresaretadozujisaditij.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c771c0968bd---56954655504.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc783d26e---parivatirezidewusew.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/72506a6022ac176d4cb6561037e89fe6/gabosovakizowuj.pdfIn PDF document text
    • http://beiks.info/public/file/34491875912.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/6545528139.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/taxikosawejola.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b460883e5a3---71708208425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=black+teddy+imagesPDF 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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 10648 bytes
SHA-256: 25034604b8352de749b1cbe131e5486775c3c99b1e3ff72a78d9588ba798d038
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16988 bytes
SHA-256: d6c56ae10717ab5011ae3de5059c6a8559b9a094fd303a179f574fa8ff96c6a1
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1