Malicious PDF — malware analysis report

Static analysis result for SHA-256 b888784099da045e…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 03:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e7e8d48fed76e8c5e43092c1d3c74b5 SHA-1: 50c031e345e9ddfa9c47c32a81e4d20bd29d8b8e SHA-256: b888784099da045ef0e63be66be3f24f97e43a6c80a572cbc001b0f767800023
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics confirm the presence of malicious links.

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://aronabritcan.com/userfiles/file/debudimuf.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105d941afd42---fawasuzomi.pdfIn PDF document text
    • http://abnicum.ru/files/file/94449119319.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aabc8a53927aadbfd1408c1778d32bcc/48870034972.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/tiwaru.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/72742034434.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a605e5cf---lefegigezosipujamiforel.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/97404260410.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/rajojodun.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb19d880ca3---kujubuneduviminuv.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/79f7ddf5edb330dd4e8fccabd502dba9/wafos.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/14065229004.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/84148134296.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nagarategebebo.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/60476751124.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088273a8f7bd---duxojibokeg.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d4a5cce8---15234227380.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983c62355c3---fuxuxuxijojegeputanaku.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/63363313215.pdfIn PDF document text
    • https://aromamarketing.md/img/files/gipepugekadurosi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f2235bbc---pedizobode.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/676e43fe60ec202b87448760e946f389/fepijiluduxesadobuk.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/nenigubigepivetijunonav.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/lufivo.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/gutunugu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f2a47da40e28935b48479a8537e1633d/64750452372.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092695054b4e---dokoxed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mahabharata+book+by+vyasa+in+hindiPDF 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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 17360 bytes
SHA-256: d3024c6e8c0ac5e969e34fcef625c727682b77ed4c0e2c1111e3a98b91049e9e
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 10572 bytes
SHA-256: fdad82a12ee208d270bd178248cd5a5ca18952b02bc2797827c4350be8c89b91