Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aabe6626805a9a…

MALICIOUS

PDF

71.6 KB Created: 2021-11-13 00:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc8820051d414c87e34d6879d90db0a6 SHA-1: 06351943b6dd447a6d89f52ce2d594144c071173 SHA-256: f9aabe6626805a9a115cf6ffd1812a6a147f4b249521270fd39d0a52db14726a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external resources, many hosted on compromised or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such documents for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://perles-del-beya.com/userfiles/file/nugepiwenuvox.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c92266a3aken37ss3t9lslf3q3/valabogubifuxoxosolejud.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/7203773366.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/45361996481.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/lavokefizado.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/82065480206.pdfIn PDF document text
    • http://ranchobg.com/img/file/37829045666.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/latazev.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/19605938327.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/93977215409.pdfIn PDF document text
    • https://tigapilar.com/upload/files/44269883572.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e0c990f642f0dab88faecc08b2acc559/37390932786.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/patedufodapatidi.pdfIn PDF document text
    • https://htchninc.com/d/files/beluteronob.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/wolonorarizurebuxu.pdfIn PDF document text
    • http://eqsport.nl/userfiles/file/sutakudabipufitobud.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/difezomuwudidurila.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/99291441630.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/92236668283.pdfIn PDF document text
    • http://trieuduong.com/images/Download/jozogusajafibofononaxili.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/pirafom.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/savewuzizejagizewefujipa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6ev1lb2bijh5qadjt207nn435/munaxufem.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/xukoponudixuwuwivumaso.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=what+plants+do+not+need+drainagePDF 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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 18436 bytes
SHA-256: a5d13a342c715e5b2f173657ad7a07e827e9421bd4275aa4555d97e214726fde
font_01_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 10664 bytes
SHA-256: a07388f1cb6ff0efac00e104cbcb33a72fd482d281ff1606e7194cc5bb360ad1
font_02_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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