Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8e2a6d55c7dd18…

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 09:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4dd54a4f36c3ad6cbd2159fae5279a1 SHA-1: c6ec7f5aebbb548cb26da407827c7d1af22852f2 SHA-256: fc8e2a6d55c7dd18eab3820f610d78a00210b7445039c4314aa8beed104f8cc7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous external domains, many of which are hosted on disposable or potentially compromised infrastructure. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://stark-tools.ru/images/uploaded/7725980838.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097da83c4206---senisoziponofolimozinora.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/zobugafajebulezukuvofina.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/xutopapovedupibozar.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb0b1f123---13598518261.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/54q46gs7vicbt2uone4oac7gi0/95855838404.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/60302209647.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/79807108510.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vinpna2assk1cb73sdghcgvaiq/vagipenojegofiregi.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/2588042816.pdfIn PDF document text
    • http://kleiberit.ru/files/file/11523268052.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/102129fe59a0a16e6e699147da562adb/16917397500.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e63130482d---22629837557.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08c2f2d021---75331308740.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d5cb026c8d5a5fdef4e5ca933795d9bc/xeputuwuzasorodem.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ae7ae6ad---pojozidopidaj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3eeed8ec2d---71074008098.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608887f9468fc---kenivuxinove.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/61023603181.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f598183ed7---durunofojevofap.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/47642044812.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be15352a2e2---2444458209.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e379586cef5---82666628963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=take+in+nyt+crossword+cluePDF link annotation
    • 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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 17296 bytes
SHA-256: 2874a4fdfdeea37650093df47311f5e1b2917c5bc6a92b01c98cc8afeaa2ac11
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 10720 bytes
SHA-256: 9c8c705f4d842d852315917894d256325bb59110d4bf9d46caf172907cfce0fd

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