Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97053bca7abafce…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 23:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecfb8a85461f26763dd8c0a4e4a8d9fa SHA-1: 08e5babdeee2bef649f346157dc6517d8bd07227 SHA-256: a97053bca7abafce4f50482f04bf1cb3a81f74111a54060440a05178e1605f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. Heuristics indicate it's a link farm designed to distribute malicious content, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=painful+urination+in+men
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/bugabetobosemenavigajodu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2dcefd9b---gizorupegulubi.pdf
    • http://ahdjcm.com/upload/files/xakumanegugozaduxanogur.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0301a4dd782636711f1a4332b5fc8cb3/kagelubonipomapa.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/18957dbd1ef029af1e7153011bc44ef4/petojuterulogowa.pdf
    • http://apcmagon.com/userfiles/maruvoxomama.pdf
    • http://www.dean-cpa.com/files/adminpic/file/49174737559.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sgcn5g64hhbudeqscvfv2ss0qk/xovabedepazasowonimovip.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cac61be6607---rokuwevi.pdf
    • http://ellenia3.eu/userfiles/files/xidasixemibumowali.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/lijigavi.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d979b678---51809477737.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392a3a059b---kogizov.pdf
    • http://sgpeo.pl/users//file/golivu.pdf
    • 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_off0000efde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16792 bytes
font_01_sfnt_off000107f0.bin
fbe519ffe162e6fd62bccb53948c100e32585225f87d945f097259eba3f6390e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 16292 bytes
font_02_sfnt_off0001321f.bin
2890ddb1ee46acdd06f7d2e2329cd28e4c35bc48f69ea6058d23b9b647be262b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 10308 bytes

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