Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21147a10c9204d4…

MALICIOUS

PDF

72.9 KB Created: 2021-06-25 15:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 196689c959e799401123cc46f906b59c SHA-1: 95815fee24e4a75e1f43f42ddcd4886e7e251913 SHA-256: d21147a10c9204d4dac30bcc0afe822dcdbc49bff76e463c9ebbc19683b9026f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised WordPress sites. The primary function seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=does+protein+make+you+go+to+the+bathroom PDF link annotation
    • https://bataretak.com/img/files/file/zusujusoxekokonavekuf.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/df035743f8f8a4afbfc556f9d4a7a71b/jarugofajik.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8bcd15e3f90b7d1d61c136ed87b7932b/38474022056.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6d861acec47524cf7a4e414fc9b1aaed/wugufonape.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/94232b5ca2d83f6463ea341c9047e993/guzilabadesolesebosolelub.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3020665566098a898cbeb9.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/noguk.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/liwogafiwo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tedobajux.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee422fd950168bdae24e62f581d25743/wodilipogufo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/26745bcb78665a2a7f2821d1eb487e90/91665634249.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jtqsai224tq3cg875gn2k02b8s/ludawonubatufobilezifu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/37cb63c8d28b6fedf7ec69aa7e9966a5/bikatijezamu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607375ed90b09---xaxiguwusiluvenapibitigu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d08365f03bcf6ec4a289b2ad873ea1c7/xerurer.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1f1b1e27---90923706253.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/onbekvgetvujqcerrsrih233sa/21221738940.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/882h8ktf7k751613cl1t0mrah2/bamumepuripesuxisovarum.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4483e8f6f---68403007066.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_off0000b89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 16728 bytes
SHA-256: 53e0c30c1512fdee0dde60d68714d484aa5f389b328f460a6d8c8a68d5614010
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 11100 bytes
SHA-256: b574496999f3e0fa65af3261d4016ece968004f6af1e7d88e50a0ac9c0142b02

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