Malicious PDF — malware analysis report

Static analysis result for SHA-256 63814874e732202a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 18:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed2d0279502709ac2bc3f6537939f849 SHA-1: ce776acdb6c19a9dfc51fa487dcc6bbc65b279b1 SHA-256: 63814874e732202a6589cc2e151c33d3d35a228518dd8d79c666ae301fbd2db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The PDF structure itself appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=instructor%27s+manual+textbooks PDF link annotation
    • http://mytrangroup.com/uploads/userfiles/file/98246932945.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9766d4b22496353f0e4e76c47eff7894/gupirumituguzoredomojoku.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/kiuollrf3nm565beqvkp180h17/kiwinuzafepefuxixenexe.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/67re02nrubkub8d93ve1g0p7ph/74147039515.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/vumera.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/95260204281.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fidle72nuhakmoa4807i7vp3a1/80342259064.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d8f69c60bd137958813b109d1deea2c1/meloleluzizutatujafigotos.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160774dff31cd8---80615845954.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106231334304383.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/59430131705.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/lugogomubadupipotezitosoz.pdfIn PDF document text
    • http://bronia.org/userfiles/file/lakexoluluxid.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a540fae933e---31324731141.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/osl0eag1490ejpcfg2c73g3tm7/juxakewivesezigorawam.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef178d6d---99637945280.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/erthd4g57hh89hhki44on4nl57/fugisosezijinavazusoxafiv.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/norevusisizedaza.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/mekifel.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/75105829597.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/roxitanoguwanudog.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/zaliwobizaz.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/32313043860.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_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 10720 bytes
SHA-256: 74f55a98329153aaa0376831c2c0a15ff9867cb13459f5688349a057b7152e98
font_01_sfnt_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 17468 bytes
SHA-256: 02be8967a96ffef2bd64eb3c5a651ba82f21a0311f75e245f7ef6173a4371f1e
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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