Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dfbc4bad3e14e0…

MALICIOUS

PDF

96.5 KB Created: 2021-09-04 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6042ab2ce435d72bb2e10cecc37b1f13 SHA-1: 6b13ab34ed1bd105e7f93694f1358c6cace89383 SHA-256: 36dfbc4bad3e14e0017a988c960e8619366fce546687308efb7f3869ee6af32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=primaluna+prologue+classic+manual PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/68fa82960e3383cb5db0cef6ef0c5045/3655712608.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160843e7a87a68---tezekajoka.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/55458591502.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/xivalorafane.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/sogutajozu.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/89079926328.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/54982212230.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/95a87b4d00270550b13ca478525c6353/93325390085.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/dimuzuxira.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/darafogiza.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/59397753548.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/gajunasasu.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/8135374569.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/42736681607.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bd20c2304---8963874095.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c1ba5a0a74d58c8d032053d216fddeaa/dovojadeje.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/modoturudobixanag.pdfIn PDF document text
    • https://beaszemin.com/files/48925629490.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/71449611388.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e2a8f1e44d453affcb417b7f6104c4c7/kupuvadamumazatuz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gsup036flbb43020ltq68mv43t/gifamejajefib.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/dimapofolazi.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_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 20144 bytes
SHA-256: 0ac0d00b953dc4ac34a7452702724702ab46c3120227e60cfb3fd7fc9a1cb56e
font_02_sfnt_off00015bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCA 10720 bytes
SHA-256: 2ce9025b222b308baccaf8b8edfcc53276a5e2de7465bd2d70a160cbe03309e0

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