Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08b56af655c4322…

MALICIOUS

PDF

79.8 KB Created: 2021-07-21 06:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9471690bfbddd29316c702679faeb3c7 SHA-1: 3da4dd3f43d0f91b18354bef521b263f9b6343bb SHA-256: c08b56af655c432242ac8a755bc8b121e8f813b2c903660ff48fc733e6ecc9a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate an attempt to exploit users through deceptive content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/eb815c5882506cf0549475896c517182/xinuzegiwisomegedumonuje.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/98762553327.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bd978e2cc2b96a15074927b40854e57/bivakuzuxetulizojajot.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070605321735.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160742a58a58ae---56374649272.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d5d741ca---folididurojawoliditulekot.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4e6bda8af0fd8cd1a0bbadddc097751a/suretagodagusax.pdfIn PDF document text
    • https://yorapp.it/file/9270242891.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/21560553813.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/velenuvababefe.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/wavagetufisapikudideta.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/23806867302.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/molabilijefoxuxutototo.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/pizubibobanolopojogomawor.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/97154070476.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/8493769726.pdfIn PDF document text
    • http://jarosi.hu/files/file/95240857217.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47707d509---mobof.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q8a09o5g63obbvvfk18ms58j9e/girugoz.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/15250541983.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/nunaxugojekimepu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/b20d8b7afdf053bd7d7c768a7ad26e4a/nodogaxitasot.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tistp5m3teg9holn2d70ir94e1/9724903674.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ca8d04dd---99187547051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+bean+and+leaf+cafePDF 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_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10100 bytes
SHA-256: e7f56223a6e6e20082b8a625b7a26a7fc793daccaaf7a8a539e1b7dc0e67da00
font_02_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 17568 bytes
SHA-256: 59a45d44633ddd53c23af201568519041d430035d623241d4ae53593b68f995c