Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16c364506a89ede…

MALICIOUS

PDF

93.9 KB Created: 2021-07-14 06:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed609d8d34987fe4378bb322c4d248b2 SHA-1: 16322cd04a04c274f6bc4a732ba8628c6834faec SHA-256: a16c364506a89ede80b74562a89224a7b2300fa38103bdd3d4850e608a52d88f
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing or connecting with a remote support tool. Several embedded URLs point to compromised CMS upload storage and disposable hosting, likely serving as part of a phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7d22eed6d52b64d29982e11a5995047d/vunigazowam.pdf
    • https://vietrocknet.org/app/webroot/img/files/galegatugigo.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/203c6bdeea169f1aad76159ac801d800/90468490363.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/15901cf35f92631e9b3a2852fc6b3be1/kuxeburofomesi.pdf
    • http://phuocthuan.vn/images/pic/file/17076441947.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/zisuboroxofolamolebebatow.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/10lqjb6ogr7v5igrnapvk7ddk0/gegifobosetivekawanepeg.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f54e46380e13a0a448edcd4d78adea88/jopewewedexapiwa.pdf
    • http://www.stemcellhairclinic.com/files/files/65108561181.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f58cad851---xakegelap.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ur12crkcu4lq672dfq8qtpjovc/79577978965.pdf
    • https://netlandschool.cl/files/76221372072.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ed5026e0c3b35ca5f2d84d5987057768/julogevonope.pdf
    • https://12shio2.com/contents//files/bawiru.pdf
    • http://dachastyle.com/userfiles/file/fifodabuxeraligawoxat.pdf
    • http://teraval.cz/res/file/xelikokeluxi.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1239a828207a3c3e92383aa04f6321aa/90457491823.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd083ed548---guvulotefubigomini.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609604c8986ab---35133220216.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/h7pbjcd6hdl7bt8fp9qs2sa0r5/xeduwila.pdf
    • https://alkathirilaw.com/userfiles/files/13300933449.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a417693705f---fisebi.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9lesmm827egjlmqifqn2p9t0m1/jololajefizi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9757cddd---rovade.pdf
    • https://seerupit.dk/assens/file/fipogopizavaboloku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=house+of+cards+chapter+6
    • 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_off00010b5b.bin
32f4b0bacbd62633585b74671cd811bf05b5c22da9e908694345f77e505dc5dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 17636 bytes
font_01_sfnt_off00013995.bin
f984c0259b39787cb735bbea907e3f3a1d80c7ecedb8ff34226b2bb04187c698
pdf-font-stream PDF embedded font (sfnt) at offset 0x13995 10736 bytes
font_02_sfnt_off0001526b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1526B 16792 bytes