Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ec6e60379828ff…

MALICIOUS

PDF

80.0 KB Created: 2021-07-03 11:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c61978176e4a08a7589f096735c0f474 SHA-1: 43f8644df79707c035218fa83cd6a8b825dc94ae SHA-256: 36ec6e60379828ff89f0000c9166eb731e90cbd6a37cc02abe5a9d8ea372c439
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The embedded URLs are likely used to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ahkjt.com/upfile/file/murumiwamemokofilimizenax.pdf
    • https://asthasupermarket.com/userfiles/file/lonekuna.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rt05nruoqversfdsebqr6781g9/51481998958.pdf
    • http://morethancars.nl/uploads/edytor/file/70806947782.pdf
    • http://letdentalab.com/img/files/68946653106.pdf
    • http://csc0851.com/userfiles/file/20210619224440_4mcwdx.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075900d70609---gonusidosozukogumawo.pdf
    • http://activesolutionelectric.com/images/file/xuzuniponu.pdf
    • http://huile-de-nigelle.info/userfiles/file/11186648644.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cf16e8662ec2c73ffd8385ffc3a34c03/75378487344.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/b33d7afbeea4636bb49d9dcfd42009d7/18123731354.pdf
    • http://specimport.by/files/files/biliraxo.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d9d754697d7bccf75b58343ff8b3416d/sogupuvopadafedevazij.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c24c63d31---72125504148.pdf
    • http://amandamaitland.com/images/file/79824031572.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160803278a1877---luratawaso.pdf
    • http://atek-ent.com/upload/file/fuduvufabevek.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba9e4eb42---rafalamenaduvusulisawow.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/l4rmlrhsqs2fvikg1c6g0bq28n/7858357345.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160803b2c7d965---96835340635.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c8d8af---boxagabenobapiberitas.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4360173a500e422019183dbe6057d5c0/zixuxivoguwu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/78b79067f4dd26b1169a5e3c729501eb/bexuzolarat.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9244225904---24652069804.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8db3ba4b761e1c740cd0ac9e13beb6fc/gujasakemipopiwitodozu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=play+freecell+247
    • 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_off0000d6df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
font_01_sfnt_off0000eef6.bin
1949f149055524f4ed3cfe6c3f07f14b44f6a9222fec6a00ae8359d169c66f62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10108 bytes
font_02_sfnt_off000105d5.bin
23dd2102e8c9e92bc284d720a1c7dac3b1d5e7f093add3d20bde844c010d8cca
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 17272 bytes