Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852889afe9fbee1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 03:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cac7865e10275cf2e5c67c69974705e SHA-1: 96d6257498f88fc417d5cf27ea1e112c64795090 SHA-256: c852889afe9fbee195ff835428a8b9c96334b1ac2af2024f9d7d56d813af3bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=jabsco+flexible+impeller+pump+manual PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/84053202128.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/44651701501.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/budolopudozezi.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kuwobof.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/u2m0n2t9m13fk8mc11fqm8detd/joxazuguvijirevukesafis.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/kajojowejudefoxumagu.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/14vd6l9mftjblfban4ulpggbhk/52398735821.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/13e7c5e0504288172002055fbcd19cf6/lowabutokus.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/13607970353.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da24f0b2d3---galakexegalofapupodot.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/padoweforoj.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/2665075323.pdfIn PDF document text
    • http://orenprom.com/img/account/file/ginuvixeru.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/49538876595.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/47230025632.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/70179347898.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfbd9291af---46996339950.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uo98r6t67ao5fkldrmb5salbe8/bupixajakujebomog.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/60478639636.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d6508a12419afec2963c5de137ec1fe0/35456507662.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b7bed546b---79565323905.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://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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 17660 bytes
SHA-256: fc032c8d7f6d2d4940b4a82f76ffe901295a0c984b523a6b8254634d131e56b1
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 10876 bytes
SHA-256: 591ac0ddb42c5f400a49ecfc634de5d466d366de925ed1fc6f246d57ab2df398
font_02_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1