Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcafb28655a386f2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 22:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 966bb3759609dda07c4b55f6a8783fe2 SHA-1: 2e435fb72c67b0cd577eca5c787735a510720a09 SHA-256: bcafb28655a386f261aa3fe7e6540ecc409ee71b2f63e5ef25e9fe3e019cb1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=housekeeping+checklist+for+hotel+pdf PDF link annotation
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/pomizezupolajaxemamevog.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/27881935653.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/vakoxutobuneralaxofuxuza.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5208caac9a21136cb8a9a1c2167ebee0/febuvaxitamam.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3f2ad726584edf4dc8877c58c7c7dec8/tijamadasumomedafox.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/91146193988.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/kefutesowumawona.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/25679341145.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/41841662721.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5cd3b28e---babivuzeririk.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/15849321982.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0f56ad4a9e51c05e42ddc6f2c64ddfea/52038470486.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/59279952615.pdfIn PDF document text
    • http://praguetransfer.com/files/file/nubomarevunisubukiporiw.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/8148673609.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/93218720328.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ef73ab1---bozofowatebawiwabure.pdfIn PDF document text
    • https://coluer.ir/documents/file/68827396824.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/pavibediwasigagulub.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/jikoremiserofefojapaworiw.pdfIn PDF document text
    • http://webursitet.org/Files/file/kevevufapo.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/taruvigobudoxexofatin.pdfIn PDF document text
    • http://cocoal.com/uploads/file/41326786062.pdfIn PDF document text
    • 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 10920 bytes
SHA-256: 5c5a5a8927b549e2d4aeb44a05057c8bd260dd036a54f7afb5376ef414f9dc77
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16804 bytes
SHA-256: 0830af1680997733d1323e71fdc0fe183659ab809df9e4e2269bc960392c2fbd
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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