Malicious PDF — malware analysis report

Static analysis result for SHA-256 464aeb9605cfec8e…

MALICIOUS

PDF

100.7 KB Created: 2021-08-30 06:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d7433cfb75de155c18510b524b6e868 SHA-1: 8bdd8b8be971f67e014aa3728f81382df562dd93 SHA-256: 464aeb9605cfec8e10493a898c719ba5fafd4c94cc6c43737ec352b17865ca5d
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs strongly suggest it's used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=rayman+the+great+escape PDF link annotation
    • http://byecook.com/ckupload/files/58951169669.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/bevenotitagelijakavu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dd6798e70e34f52b4b48971d91394be/49505737124.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba3bb6815---32372615731.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/30541957619.pdfIn PDF document text
    • http://computerdoki.hu/user/file/60806521820.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a67e973a---85126181178.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105efe84054b---4836489711.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/go8tqa22ipc09gc34vi61fd4ku/nigizokojanijapoket.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/70523446900.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/50062262716.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e296397c4---dakojov.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/vumigopisap.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/bosuvurotanopuxul.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sgbpjg57on01j4b2r55cu147ip/zerekifaseluvexura.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/82685995180.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j4mbc27v2je078t8oguv13792n/kazodegowopajuzemimusumi.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8ff9abcd---93775514651.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/97509777922.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/sibiwobomuwu.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/84079951784.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/69800550791.pdfIn PDF document text
    • http://sam-global.ch/files/file/tobaretogizixu.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/rutilafinakapela.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c87e5db2---voxiborurisanitogu.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_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10720 bytes
SHA-256: 0c5fd3767d63a969dfe1667ea23a72b365206353e4d72b37fa02ec6c27d6fbea
font_01_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15406 18780 bytes
SHA-256: 3042e8f9f5bfbb5f140d18f51bf7add814b780f7d567c05cd4fbc388ab5bffbb

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