Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcdea5b8f275d70…

MALICIOUS

PDF

91.0 KB Created: 2021-07-25 21:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddc0f48098d64054c68144efed2ae5ea SHA-1: 71f22b01d90819938855b700ebac0a7240478ce6 SHA-256: 8dcdea5b8f275d70075cdd2730cec7ca89c79dbeb5814e8dc0f3e1dbe1d37d09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://kanalprofi.at/UserFiles/file/45490380048.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ac37d5323c5f5c421710bfb8372f12d/pesowoxatalugep.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/24326909792.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/suzarefumixug.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/41099292274.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/58e1e91bd0a574ee7266a50b4857341f/lovofejisubexi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5e26429eb319ccdad3ffa9577ec1c453/7218531012.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/75f90a25a3f533130888ac78bf252c1f/rofowibesodarowokuj.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f1a5ac4146f7cd2354b33d3a320bbb77/rutawajirozepu.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/67376242077.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/94249850164.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1n9c112juq5ijspept31083bv2/53721929143.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162518294717.pdfIn PDF document text
    • https://schmitz.cz/res/file/vakojoje.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/zokanelekoxozej.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc6bbe1cf---nagefidefirujamanetalamix.pdfIn PDF document text
    • http://tano-cable.com/d/files/4579498550.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37523d3ed6---16373696116.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3892d2598---52046748332.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/15f3efb457489a16a5047b2e3b33fb35/11805193535.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eac484a73---tatiba.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/puvubomi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5romehouo7b9fcd3232hnejqv9/52294498254.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wedufejep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bloody+roar+2+descargar+para+celularPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 10784 bytes
SHA-256: 50d5f7bbaa53f4679640d2f82391d802ca6266cb63c4cf63a93c33ad3f8a3911
font_01_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16936 bytes
SHA-256: 48e4084469f3caa728370dd5858021d5a5451d92427b7095b147a513cc2c3bb4
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 18452 bytes
SHA-256: e51e069ea3104aac735a92ccd9b407a858cbf63e8765996c601d371518520de0
font_03_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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