Malicious PDF — malware analysis report

Static analysis result for SHA-256 139cdbf0857b7453…

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 00:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a62050f3222917478b18fc54e4b5c48b SHA-1: 3fe2c7ff0a40a154edecae2dfabb12f543395168 SHA-256: 139cdbf0857b7453b088353471f95f4ba94c55f8eda3afb882d1aafa80b73383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs and the heuristic firings indicate an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8abf2f225---vobababelipitexogobaf.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h9vghccl4809l1uavn71ve284g/6887941263.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g25senfr9iiv2ve7eeccgk5ce3/10999987197.pdf
    • http://dinskayarealty.ru/media/file/xifejorumazamafupoz.pdf
    • https://faktxeber.com/resimler/files/44511125609.pdf
    • http://lycee-elm.org/userfiles/file/towujasuxeferog.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaee5263e---14715415598.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/91545144087.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/redalukili.pdf
    • http://getem.eu/files/file/83694461955.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/52907842630.pdf
    • http://campfirewtx.org/userfiles/file/latosofegi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e288799a46bbb968c38adf5f44692d0c/kesad.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fa6e0b2f2eb3bbe4eaf669c195461e6b/mumesa.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/cb8d81f0ae1a88ec36cb8e5a74487272/puvesidefimabuke.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c825dc9b---75411980912.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tftajt3m47g1hdq3k72cv51620/90614392816.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8a183ac3287b8e6ac1638c8856f8e1f7/15380374992.pdf
    • http://ansing.nl/userfiles/file/71826192947.pdf
    • http://rolmech-strzelno.pl/Upload/file/19166888343.pdf
    • http://phutungtdc.com/upload/files/kefikojaxosujeginujemapa.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fozanijebokulojigajuda.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/72871244046.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bac97ef8e5d8a516a2d2ab16fd42643b/soxiwat.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6985eaf25567afc38715f6594c9963ca/dojiraduk.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/df594d3e43b972e9523f5453d953e236/vufojutikar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+grievances+in+the+declaration+of+independence
    • 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_off0000ee47.bin
ed956533d03696a6de158d3e8380b8c7b3262486491230a4850613aa2ea360db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 16796 bytes
font_01_sfnt_off000119d6.bin
f12287fd7178f70c717077205166c742d1d6a4160816094186be20f64c62130f
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10928 bytes
font_02_sfnt_off000132f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes