Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b619635703e793…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 12:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6210ec74c97c3c785a0681f083a9837 SHA-1: cc679b9550f45277efd016b8950f1ca556064a90 SHA-256: 70b619635703e793414519c5f70967aa355e617773f1f074165fc75b97cd04b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and compromised CMS upload links strongly supports its role in directing users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://queure.ru/uplcv?utm_term=underearners+anonymous+recordings
    • https://rubenferro.com/userfiles/file/sebegigipubedo.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u252q8k4h2hud2nrmc9m84b4ab/wirirililefik.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f2a106c4---dinig.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915a6165c4a---47520940083.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d585bb357---12283015291.pdf
    • http://scandirent-new.ru/uploads/assets/file/kufes.pdf
    • http://marcelponjee.nl/ponjeefiles/file/zujipevopemumirod.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a1d577b7c9007f06c174372c71971205/dosepopesatozumogaf.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bcab2a821---ziwugofu.pdf
    • http://dekoblickfang.de/userfiles/file/zufokesolima.pdf
    • http://alexlunacoach.com/img/editor/file/zovawaxefukukitixuxexu.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7b43c7c147fc2bfbf42d0bd6f625c224/82913074569.pdf
    • http://mt-filtration.com/uploaded/file/133434808260c9096388a04.pdf
    • http://smepil.com/ckeditor/userfiles/files/20609703267.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753812602e9---695542364.pdf
    • https://echipamente-scule.ro/userfiles/file/58426348069.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8445844f81d05d77f2cf3a502aae3ee/71837145881.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094341d3aa84---3740873158.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf0ad889fe---vewipomikomu.pdf
    • http://ruresept.ru/files/file/49272894268.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b51bd0e7fb6cc79db29a61365559b3bb/71984544957.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e5e32818---33458483055.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1ad5107a---61979117805.pdf
    • http://georgefamilyreunion.org/clients/86186/File/70672058044.pdf
    • https://adsbudget.net/userfiles/file/97961087385.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ac55cc3afc177db16f8514114ab60c9a/64616585736.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_off000107b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 16792 bytes
font_01_sfnt_off00011fc5.bin
a19ba5b50dc4740a191dcadd0fec7ab363a6d187794639c66f1a36048b153f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 17608 bytes
font_02_sfnt_off00014e60.bin
3a19729e22850e6beed955900b08dfabc3620cec71b9fd71a63dd337fb03e141
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E60 10792 bytes