Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13a3910d1bd5c43…

MALICIOUS

PDF

74.2 KB Created: 2021-08-29 04:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dca57b01996373b738d8280476f1196e SHA-1: 5d31f47317c4eab0e19e4441cdba3e437d08da42 SHA-256: a13a3910d1bd5c432f29714705174a5469160efda7442772f15722e257c61499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917a75f0dff---runifukuxasomewepawawes.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d9385e67f366f0c948a2f8a750d8efc4/jejipimizugipuv.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/lezavutazefewag.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ebb7e0c6---bafeliw.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6d2b3267d9420d823a7721b71a11d55/77958228085.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/ribalekolelilol.pdfIn PDF document text
    • https://purefeeling8.com/data/file/39685507488.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/48090496172a36481dec05162fdce429/wofugirilijuxumusun.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210608_114817.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/rabezoxutizixojinosupom.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/pedanug.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/jedeb.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c8d23447436be42b0e3d276daef242c4/86912486449.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/36509395758.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/xukid.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7a6ebb68---13681239307.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6470a3338bbf17fa4f5b1bd20fe4b326/nevet.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/bazejizitebomosi.pdfIn PDF document text
    • http://chineseclothingonline.net/File/42825654944.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/delupamexuwis.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/55505852807.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/peviwidururovozidu.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/32899493693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=firebreather+2+full+moviePDF 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_off0000c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 16428 bytes
SHA-256: 54ceb458d8a12ce13233e2f6a22b2965a5fa972b300703bb20b4dd278c88d02c
font_02_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10608 bytes
SHA-256: bf238ed16f94bc1dfd3516c4b9c967629e114f0aea628cd20694ddec7a80d7c0

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