Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4098d055e2f7b9a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 09:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 50a20793881e3841587716c2aa808e87 SHA-1: 79a8bb3fb355e0d99cc82482af8c8ef947fa94c3 SHA-256: d4098d055e2f7b9afc4ce00b1743f0055bc4a003f911d4c3b184867803343d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://qwerty.pl/_data/file/dozeketikaraxu.pdf In PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/39963716901.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/vezusupopodujepezinez.pdfIn PDF document text
    • http://jonellchem.com/upload/files/94982921808.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613831ddcfa97---texoramuropavenefemozewuv.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3021894381.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/13564585320.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/1756890683.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/jadefedunajalidid.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161411c93eb45f---beramuzadujetobe.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/45189595297.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d43d5e70---90557647179.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/3581282090.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d54025c---10621562845.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/jetiliwal.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5cdf819f137d0a0436e57ce139e53026/22490333270.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/640b82be704393959809207180ebc4db/16404993854.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/80272908574.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141256c87483---36385545494.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/73233770155.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/javuriwasibepefot.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/86567035900.pdfIn PDF document text
    • http://js-space.de/userfiles/file/7296991200.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///japerulolejozarijuvejidof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=destroy+me+read+online+freePDF link annotation
    • 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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10632 bytes
SHA-256: cf67c9a69eafac33a8492f729a5ba1701d75de51be8cd8ec7f38188e3ee34b3c
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 17496 bytes
SHA-256: 5f3e8a4d830cc45f47feacc1f4a020da5c7dd69187516f671400b03d7d40488b
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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