Malicious PDF — malware analysis report

Static analysis result for SHA-256 6316c12f8bc52d33…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 05:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8ad13b07dffa3b5309f09d8227ff6d5 SHA-1: d2071dcacd7eceb941cb1405e57e706e9c11dd81 SHA-256: 6316c12f8bc52d33b05d2e658c0a0f323fe528a53f9acceed94c0c03572fd73b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method used to evade gateway security scans. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://princeworldwide.com/multimedia/userfiles/file/putelepafifutuv.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f16681f4---fekalof.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094888a77ba5---lusino.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2abbf1fe---garodewo.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffbc96ad9---milorumivavuti.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9430f1c19fd697539bb5d18e6cd99c79/jakejugimazuz.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ab416b1c32c---tupebosupogavase.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd5844360---luzenegakagexaruvilulu.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c2916f785d4c3ad3b7aafecdcfc84088/3659017830.pdf
    • http://www.findvoters.com/userfiles/file/buwebedoxefasojuwi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ba8b728601aea5d757e18c99670a8a2d/85542987491.pdf
    • http://bassbasement.org/userfiles/file/22401585585.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6h818ab8bdmocgtqeolht3a58o/xiguxukowefa.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160852d0c4a61d---kalupebixazoxupenoda.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///50542605587.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5foq5cqkg73hk1sst7tmmnqmm5/53574003448.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/u862b145t7vkfm7blb2i9s1u69/76167067526.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/85af56ab68564370a2085018aebbaf84/gulemovom.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/p5gt4jnn238nk5r048dembril5/kefaxa.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6f298d8924fab2bf7fa2505b1c6673a0/59146307784.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/42242090817.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/telixidubu.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46358bfb83---17556892107.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wedding+anniversary+to+brother
    • 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_off0000e7ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 16792 bytes
font_01_sfnt_off00010016.bin
07d3f8586706b7d41b1b080e03d7a2ad4ab82c129572760fd99bb4c72a2f4c23
pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 10792 bytes
font_02_sfnt_off000118b5.bin
fc48b2e829b6664c35e2f8f3d2ab41691a89918feff5bf8d80bce4cad4e19d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 16692 bytes