Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dee089a2791618…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 02:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5fa2f2ed63f644fd46963a905403640 SHA-1: dea16a1865948803072c2363ba9d735720c48518 SHA-256: 97dee089a27916187ae5153ce529e3fc40701b37b27ae59c558d25c5b50b58f2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://laborke.ru/uplcv?utm_term=how+to+delete+clipboard+items+on+android PDF link annotation
    • https://weyergans-hcc.lv/userfiles/file/guguramolejuvetusororotil.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zarokepuniv.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6565996430.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/53862420919.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/farigidotoro.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/zuvobaripum.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pexipilurel.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/022054452198.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/guwubujuluxar.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6100154306.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/88229612012.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/xikugulifuzesadu.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/84116331563.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/vobifafodawidaza.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/fevezavamiwusemuzinameg.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/juvekonetorejexa.pdfIn PDF document text
    • http://packamate.com/userfiles/97713779674.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613651e15767e---44233753181.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/wiguxosowaxagotokabufe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4fdb2800---43830763150.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/padebipijikevetijoxumev.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/mesujesewojijag.pdfIn PDF document text
    • https://duel.pl/userfiles/file/66164712118.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85004431721.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/63571915443.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/61007a5b885c6b30538ee5fba79bca60/86657099467.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10892 bytes
SHA-256: ce9f6af5a54f115bad904c5c8e233b47ca7a6c578026fc639b1fe61e7ef2dc43
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16840 bytes
SHA-256: feb679a1671aa9717de5aaff802d469cf4625037b8785204ebd2b0ac50e103ef
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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