Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db7af2731bf639c…

MALICIOUS

PDF

95.5 KB Created: 2021-07-31 19:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4298d270cc5f8683ab1968ff789df014 SHA-1: 10e1e1ae67c1527199afab9e5cf4de6343d1884b SHA-256: 6db7af2731bf639c43797d9d909b10f0e32da0d3564b39b4437004948cb77612
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=what+is+a+friedel+crafts+acylation+reaction PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a1c05819c3f4fc33b873de8126788a9b/60048083895.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47651050284.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d5536ae5---79852446920.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962849504ed---jadiravatuxumukewuvase.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/juvuravowudugag.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081280eaf4ae---68768088342.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0da9219897edc640dca98bd5c962b2a4/xilatugojilazenugiros.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea6bce55b---gajiburovimokoker.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/xawuwuma.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bukez.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/47bb426308374ccbd2fb6c06808b51fa/tanilajijudopowanakut.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/mamurusumavaname.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607673990440f---1720629157.pdfIn PDF document text
    • https://tmtteks.com/files/sodipenozabadipo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/008jebfcto4bla2ljlhholclo8/ravoli.pdfIn PDF document text
    • https://aokman-drive.com/d/files/70879334707.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc02f62986---43474825066.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/vegonurasode.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/zefitunumupixipazeb.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e226e5ad18---fusejejilapidubevakolade.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/liwomet.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nafotonozorojavar.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xuwukepupawedu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gag2qfpc672tfgbbg7e9aq2ta5/suvowerawipu.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/99366613611.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_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 10680 bytes
SHA-256: d4bfcf6b1890117b1eba855080bba086251dd1e1841e81fcb51b45ec65938c51
font_01_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 19908 bytes
SHA-256: 2a1bd6895b7a9795c41ba2a4901b960ded9d36a0da8e6274e0f79be3a4e596a2
font_02_sfnt_off00015701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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