Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f5dd07244e50e9…

MALICIOUS

PDF

110.0 KB Created: 2021-06-30 04:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9d38a240f3c447a5dce84b321ad7615e SHA-1: a5a650617fe7114a2594c703b158ccf192ecb163 SHA-256: 10f5dd07244e50e982c8fc8a4cda784f0887ad8946c7af4360c5ec8e59701bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=personal+troubles+definition PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b8b622d29110d0cbc013dbdee0b6e109/fomowuxujev.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pizovefimonanituwu.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/misanira.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5322cb794---bavuvodovitumim.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/38261084501.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab1a37df5---kelomorulupodaduxefitu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/18581426514.pdfIn PDF document text
    • http://lucann.com/Upload/file/45922056751.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabb93fc6f---kexeranovupa.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/15460451705.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/29997051401.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/tisexewivugiga.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9aceca24b01adcc2593027c854badd73/48088577269.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8d8aa9a4c1afd6575e42b81ae0369eb1/dimaviwotunowofoz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b74324c04---13283760422.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c1fbdf1c---71653294489.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3a03196131114347370544e7e4270827/midasajelelumejeju.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/57740902940.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a3d96495---pivodewewufededeviwa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e11e8ce34---dijepajutet.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j3n8881m0v9saghifam7o9kicq/weminuzarinik.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6dbdb56e---nifonisejonamuzobonew.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083efbe195b2---51619585930.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1abe9e9b---jitusat.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_off00014c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9C 10588 bytes
SHA-256: 527f33f850b067d224e4c0de9bf3a91939329bdb0072477157cab183dd52d0a9
font_01_sfnt_off000164e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E3 17428 bytes
SHA-256: b068d3a36b2bddd6ec5ff03219e32f4e094114a5f3f3905e3fe40fedb8a11079
font_02_sfnt_off00019270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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