Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c595b33360ee6c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 01:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 699e5e46207f38d3e6d87bb6fcdb2082 SHA-1: a211f0992ae43a3602c0c4756baa4368dfb065bd SHA-256: 19c595b33360ee6c1277a13439e9ebe9b18e22edcfc6aa5df2b7cbbccc4562cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://silky.ae/images/bulk_images/files/xijenupexaropumixesuwu.pdf
    • http://pusancard.com/userData/board/file/vuxutofi.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/o3ec78obnd5511ela4nuetotpj/36195295690.pdf
    • http://eszixv.hu/ckfinder/userfiles/files/89881787273.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089b25a39f35---muritedesijakizamevi.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f17ee861bfd---75232965502.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/vogoxunogobux.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3c1b28bbc5a56dfab5575d009fe74026/64920756305.pdf
    • https://bestrecycledautoparts.net/images_i/file/katamafagirijokonajuvo.pdf
    • http://thevale.us/userimages/wekinilizepe.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/fabuzisunefedolijovevusid.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vogusojativizugifafazul.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/953ef7bbaf384ef4b04336bc71406da0/96636752295.pdf
    • http://abwmercury.com/uploads/files/bijov.pdf
    • http://www.agenbenangbandung.net/file/sotanavi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c1a2514cfb023d88470ba79e11c8d738/sopikabiv.pdf
    • http://golden-candies.ru/webroot/files/files/goduxusuteditubutawoke.pdf
    • https://lesfeesdelhetre.fr/upload/files/borilagadafixawuzupa.pdf
    • http://alimentosldm.com/userfiles/file/23870416642.pdf
    • http://tianfonmm.com/d/files/41383380622.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4656f9518390b9bfec7fca9af98ce636/83842627927.pdf
    • https://autosaloncenter.com/uploads/file/vipanipipidovizowar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fiasco+pdf+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 16792 bytes
font_01_sfnt_off0000f28a.bin
0d2fbabe4a733887d63135f364f35da040ed6b7c76b9b9beabc49d524cf73c66
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 20648 bytes
font_02_sfnt_off0001285c.bin
4c7873e7cad44520d5946668a134d6bfd17955df39e76db87a3be2660986f6ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 10492 bytes