Malicious PDF — malware analysis report

Static analysis result for SHA-256 0313ea3fd03fa702…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 20:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 409a1bcd633f252318179f0b80633d03 SHA-1: bede2d5628b093ca70b25dfddcec4111803834ae SHA-256: 0313ea3fd03fa7029aafb2f1e5c328520c9eb8027420f59dd584ceb546b1b641
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous URLs suggests an attempt to distribute phishing lures or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=fc+bayern+live+wallpaper+android PDF link annotation
    • http://greece-ex.com/images/blog/file/jedigorexagila.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/64682075092.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a097b2d1b3---funonuvogabunomuvasibi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/13705441519.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1l23im18hue8lu7dfj7qbjs8g4/pomolokesemikukurez.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613102174898b---sojex.pdfIn PDF document text
    • http://www.depomatrial.com/file/tezokaz.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/89104578405.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412224bac7a---manotirabuxonom.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/repoga.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/dumafikutudu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172f8add65---fawesabaruna.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/poxuluvavozapew.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/29900555521.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xudumenisewidojijefak.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/31356671622.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/dakawakimiwo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219605179618.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/13131514778.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/buzivakupopepone.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880bc756a2---xoxetapizot.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/gobelezawijujavisuturapa.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/meliwuw.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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 18088 bytes
SHA-256: 10850568a5f9dcee56c16be3b2d73332fbc5e83f68cd3c12087156cd43bef28b
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 10624 bytes
SHA-256: 8eacc3713670200d00cd9fdb3a3f16a28165692547f7a664820533eae639ad73
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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