Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2316b2cf4f164e3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 18:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0a6905a9da80bf783738e93b32988dc SHA-1: 8cd439c8cd432e740be6b7115fc41e5b6b19ccc3 SHA-256: f2316b2cf4f164e34c94d968f3eac28f388725781f42b4f47182bdf02c335d96
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.santamyoga.be/images/file/jojemiw.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/21582544833.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8fb57446b764d5a82d3b5c2e98099acb/79555562603.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608eea9429d59---52102698524.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/85855223279.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c544cb3e752490f79db33b29dbc4878b/90627387711.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98833498f6---15929274455.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/navibapog.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/5692631683.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/1473258870.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/xexibukosigonumev.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/85293088789.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a13372205ef---46057156079.pdfIn PDF document text
    • https://5uempat.com/contents//files/66250706469.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gotujigifisufosamabope.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/kutuluwov.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/purotopafoveso.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbee8541e2d---27623209536.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/98f90b2099b8898da16d592045a9854f/5926141586.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852668bd81a---3133740132.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210902_012452.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786e15bb11f---ronatonomo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2726d513c5d4933acedb90795efe8a12/lenuzamitusuzoxegubep.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad40c488b---lojotupafuwomadik.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pvlhdpcgshfi245kchq73fbto3/22047678361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=can+i+add+a+pdf+file+to+a+powerpoint+presentationPDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 17692 bytes
SHA-256: 3ea6b28f2ad2553f2d4ac1044a250992c07a71c7cd51a3d6ce2a7eb845a8e038
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10608 bytes
SHA-256: e1344dded7f3e04e69175cd6fbe24f923cad809df1af9d8337e3ac1ddf96cfa1
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1