Malicious PDF — malware analysis report

Static analysis result for SHA-256 8601ff4764635e50…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 05:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0731940ddcc4ba5fb80764d84b186f35 SHA-1: e28087c928d1c5f8c44a7b6e5406d78e99b18f3c SHA-256: 8601ff4764635e50db7bd7fa3c7515ed9945592336b1310f10eade046045a87f
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of external URIs pointing to compromised WordPress upload storage and a link farm on disposable hosting suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document attempts to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=manual+de+microbiologia+veterinaria+vadillo PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090c52edfd9f---51372572335.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/botenivusurejazuwe.pdfIn PDF document text
    • http://thedreams.cz/files/loweralogujuj.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/22080106285.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09b5c0e2b---74091785350.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/javuwa.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088feca172fe---wokopisejumadijutu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf1a0c334---juvab.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/xajumiwikijedojafogujemi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749e22d12ce---dobisisamawawolixubub.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/mimilekofovezevaxokij.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e0650596fc528022044e92cd7f9158db/nutumobexitoxilawale.pdfIn PDF document text
    • http://maidichike.com/upload/files/5240852381.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/lisobulotilogomazipag.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4673c15e5---72250245260.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/gosasidimukebusobimajufaw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/15a6f4df9545181bbeeb7994e47d6e0a/vizixevenexa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2afe1506491ef6e102107f6bef2e81ad/71688617028.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81613516442.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a0d80a2b---60574231097.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d25bfb4e759172387656a8ed978cccc/51834445061.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9f7fc33c62ee08c77f3a1dda5f950473/wirazukizajofisew.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca17742eb9---64104023405.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029c37da524---30267697473.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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10844 bytes
SHA-256: be78e6353df63e4a49c0326b379ccf5ff979f224d9d579c85a9e1d990f455c89
font_02_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 19324 bytes
SHA-256: b6c29747d302a16387545f3fb5908445581e2e408cff814794d949bd108fc924

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