Malicious PDF — malware analysis report

Static analysis result for SHA-256 4934cf573d2ec82c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 19:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b80094ba33db724fece45fc2816185f SHA-1: 2ed5d2ffb1f7dbd7139b94e228dba84cc3eafd77 SHA-256: 4934cf573d2ec82cbd644980c73d6f3c65b27f30633237703d43123b263a5d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=promo+code+rbxadder
    • http://nfc.soo.jp/file/34562916639.pdf
    • http://rayhovietnam.vn/upload/files/55530607578.pdf
    • http://gysanya.com/upload/file/210909173758633722oscv25ozmrdb.pdf
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/6070826493.pdf
    • https://floridainvestment.cz/files/file/36423290871.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/14749323129.pdf
    • http://bluestandard.pl/ckfinder/userfiles/files/lowusemug.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145841c38348---pofoxuvagixovepig.pdf
    • http://ge-mak.com/files/58896484347.pdf
    • https://burstallconrad.com/editor_files/file/korisifexilupuvategepoge.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133881b6d01f---tuvepositisidegin.pdf
    • http://karlsbach.de/userfiles/files/64630151832.pdf
    • http://komodovo.ru/upload_picture/64326977770.pdf
    • http://ventima.ru/userfiles/file/19358694082.pdf
    • https://clubberia.com/js/ckfinder/userfiles/files/wubodagesariregi.pdf
    • http://pretaporter-pegah.com/userfiles/file/nujutipuwexep.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362dc4154a3---zazoxoxapadovim.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340a4bd566d---56003597418.pdf
    • http://bioident.pl/photos_fck/file/ganesug.pdf
    • http://chayka-svg.ru/files/94506760390.pdf
    • http://thuocnam.xyz/images/files/melozebokinunufil.pdf
    • http://www.heksan.com.pl/file/safaxepadonazesedita.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gagofuxipadelafikodikom.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/lorafedetu.pdf
    • https://siam-royal-view.ru/data/files/vubiripetag.pdf
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/31004902513.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_off0000bdbc.bin
5dd26a8819a3804e3d0de08d189b183b0b30ccf5d9921a68b6026b033f70eb29
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBC 17440 bytes
font_01_sfnt_off0000eb2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
font_02_sfnt_off00010344.bin
1777fd1676eff29c4ddad4fa309acbf72f14af400b7ff8c08663f28a8d818614
pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 10268 bytes