Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7999cd60ca410f…

MALICIOUS

PDF

91.6 KB Created: 2021-09-07 08:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45d561475ef787515465b0502945a665 SHA-1: 99912dc95fdd43ad5516c01a59c0723df3985731 SHA-256: ad7999cd60ca410ff6252d91b5b90692a404aa46280742f87397f7fd31ce1e48
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF structure and link farm behavior suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://invest.pl/userfiles/file/77087655418.pdf In PDF document text
    • https://actorconseil.com/files/file/nitodofozogoju.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c524d527945---finafezojumobagupufon.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9j8pt6u2cfg3kcb5r7oap6en0u/mimawijodaw.pdfIn PDF document text
    • https://wittnebel.dk/file/38833212183.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160882373273fe---texomufazudozevexosuxud.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/gesuzira.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/7114634408.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/pivelo.pdfIn PDF document text
    • http://ewtch.com/upload/files/bukaxokolelavegotovotefu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fu8pvdlmp1ktf9i1fl04bdjm62/nuzevuloti.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/85482335606.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/xixotanenewopuf.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/djfbs1lvvqfnk2svp62c5m9sv2/78985562973.pdfIn PDF document text
    • https://melz-feu.ru/upload/fuvew.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6b83fa90bdcddcaeecde0c57dd723343/42869492597.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/nemidawijogobivub.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/84673601713.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e5e48eee410e289a93b976df38a2893d/darolilixukatekalabe.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/xuwexefogewodo.pdfIn PDF document text
    • http://bakoca.hu/files/file/rugizulemiv.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff2e4d106b---52960639950.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0710b51a6---doked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=life+satisfaction+meaning+pdfPDF 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_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 10776 bytes
SHA-256: 312e4804d847257ab763194a9923987ea85495ba950ad6fc531456326f38df04
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 17384 bytes
SHA-256: ade50209b0c3038caa5b626821cba2dae423858101cbeaf5ee10fd33dd7cbbb5
font_02_sfnt_off00014866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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