Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6483f6f3ec1c2da…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 12:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45517f6def6ae1f69bb2a7f2a5d10434 SHA-1: b7cf64ce0105bbf98322a990779d14927e0de86c SHA-256: e6483f6f3ec1c2dab6e99d3508dbf6f3cf048e6d96b056cc5c73e91c71826df3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qb75uccf2g942t8913h2p5a5fc/88360739550.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ugma4p9ngd50ltit8m15f0mn78/firimazadoluginawojaso.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096621b43822---dunivep.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be734b934e---81300994846.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rg13m8ln7cf2v99gi1k1gie985/15611323293.pdf
    • http://minerva-collection.net/files/files/sufimaxijoroluwanope.pdf
    • http://vodnik48.ru/content/file/60618384074.pdf
    • http://coyada.com/up_images/up_images/38291449260.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b15c0bfc---49975228480.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/99334449500.pdf
    • http://dtpokebar.com/uploads/files/xuwidij.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d820e52b4---41069574042.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/paloxedamewojikonumevo.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759cb841ed8---67021504433.pdf
    • https://iamtimeshare.com/userfiles/file/16852213721.pdf
    • http://logo4you.dk/userfiles/file/wekeserijukano.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/odeuj8b7lqoi8flf8b31fm27o7/58211641186.pdf
    • http://irths.com/upload_files/files/vaginarudorudoguwemibu.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4dc2aadd---6575933800.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/21fdedd529f2c92f49c9ec171ad27da3/28412467769.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88081ae126---xalawur.pdf
    • https://pharmnet.cz/ckfiles/files/files/7599011059.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b26df1c926fe2cabd1f7b4bb57ce230a/81876465049.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b568e09e332---mifulove.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d2f8b25d0d3e6e824814bbaf6451953c/74480068424.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+consolidate+pdf+files+into+one+document
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
font_01_sfnt_off00011050.bin
23f2f70c9532d8df3430136b5aa97e91a4043be288318ac7a133b51e6ad44528
pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 10860 bytes
font_02_sfnt_off00012965.bin
6c2f3789d1e37df9711dc354b7db77b6a4e4f943271b99c8494550cae0c8fea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 17680 bytes