Malicious PDF — malware analysis report

Static analysis result for SHA-256 c300056fcb01be8e…

MALICIOUS

PDF

78.1 KB Created: 2021-08-01 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bdf6d87f0ec61b6e481f5c5c7164660 SHA-1: 32c1dfdc61722ace7a755ff459eac376089e9762 SHA-256: c300056fcb01be8ecc273a47b96834941f14ea954d4a7b91bea525f8e32c0ccd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm, likely intended to redirect users to malicious sites for phishing or malware downloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=memoirs+of+geisha+pdf+free+download PDF link annotation
    • https://an-professional.ru/img/files/file/11390543929.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f29f88d7ac0fa4eb4a7008c57ecc3f8a/36149127003.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dfguaae53vbjfsk4mpsc9sjgkg/bepikuf.pdfIn PDF document text
    • https://immobilgold.com/file/vasixekedudopomo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f29a87a8---43510713257.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/5099727908.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j6g6hmimo1v98u5jkjbfc2nu21/winulusukuwovem.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d6543208---ziduresetotarewupotorejow.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/sopatovozarivatovin.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/64e8f14e8f64bda97ac0821af679b2e9/marukanuxeziz.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9rg5715vr74t1v023luu75gc32/15009237105.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b5eeb4a4ef7a94f74950813d72e2b4e1/19241172476.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210530_58439D035B7A6449.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/275fd4b682b39b172333f32f7e1db8f8/83277553826.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f933785bb---garalesik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa81e5986---fagurasa.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bejujogipanixijozugetane.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/74008566719.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3e03a120324b3022ae9435f0ba67033b/rupezeraw.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411ac36d1f---63263472144.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/kupepusawadituzogogewid.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hudsfjbgip8kht7auv5q2vbvlr/nosobat.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/murepelogotil.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_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 10928 bytes
SHA-256: 397cf12825c649312b97835677da35e8a2c74c19d554de38630fc5cc9198b214
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16884 bytes
SHA-256: 38424a881c79f77224540c579930823441db1f8ad42b84f30c7363fa214b1363

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