Malicious PDF — malware analysis report

Static analysis result for SHA-256 539f963e2ab11e22…

MALICIOUS

PDF

109.9 KB Created: 2021-09-02 17:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 529abc03f69c2f384db4244c00ba16c3 SHA-1: 93de031adafcfaac8c9236cc2ddbb5f08ec77c67 SHA-256: 539f963e2ab11e2229178144ece886aaaeab7760befe792589c9842b9f9849f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=partial+and+general+equilibrium+analysis+pdf PDF link annotation
    • http://rallyteamwalraven.nl/file/zixexitotokowubupe.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0a2c8a8e---5991108412.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d78c7822---karafimibozolaruwenipise.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098670f4afb9---36959176280.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/57165864e1e36bd7ac459f1435d4a0fb/70048328081.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lanotil.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/felojejugulixosidur.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/82686342591.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1753680427.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256020b136---tawimovulatukogefafitex.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/28542520169.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodogelafubuzetuxuxonok.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/31670e8e1eac54d80117e83ad5603bbf/xazutepajukumod.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbcf1f0eb---peketimebi.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/xejiwur.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8069b0fc4d---wekitafuperuvimosubod.pdfIn PDF document text
    • https://ba-turbo-j3t.com/contents//files/tepatiburufejuleruzina.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/lejanakibiwimonofoxap.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6317e406eb---79153936181.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/fuzosusasijuduxep.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/megosixojavaxadekari.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/megosinodazawegazivarowob.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/fizofifusegekixujuniwax.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/kagobusutiko.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/675939ec3e6292a82c078cd687747fc6/35781714876.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_off00014549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14549 11224 bytes
SHA-256: 1120ac7befe5c81af06529c756aab17549f0d8cdd7436550147bde1aff7b0c54
font_01_sfnt_off00015ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000176e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E5 19352 bytes
SHA-256: 755a36ecebff28098158a52ca067a6c52290fa4851c22a37a90b62c1c358e34b

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