Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3008d8c164bbac5…

MALICIOUS

PDF

84.9 KB Created: 2021-08-18 03:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b5f5411ed0bf3d06283cb3127395566 SHA-1: 0e9d8f5d9726f1c795b1604f74805f61e0e9f659 SHA-256: a3008d8c164bbac5253865b3a1037e27bce6da691c5cc6d2f41949229f282793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics indicates an effort to redirect users to malicious content.

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 https://krisoc.ru/uplcv?utm_term=how+to+use+riddex+pest+repeller PDF link annotation
    • http://teormech.ru/teormech/usrimg/file/83610076444.pdfIn PDF document text
    • http://ruresept.ru/files/file/wodesebizofozesutisupurop.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/45026351304.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebde7a9aad---titifudalomejojilaxo.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/zijejewadumavipa.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4d125027---suluvovunutotunevadaniwex.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b0b4d811---figimiwid.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/lurolalajuparagu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0dea4f626---57774786930.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/12206043927.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/20d25f2af14b7603400f5e548bd02a89/33370754863.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf402defd9f---semejevu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3ceadf31ee4a8cda811950d1560c1461/vozopalan.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608357fd43665---44697238213.pdfIn PDF document text
    • https://epiphanych.com/images/file/76606666294.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a7bdf45c331ef2a979e78a9f27822204/41501349688.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f4a2d726---rexozakuvedabi.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/40572569959.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/30636729644.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/fixuvo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb0a621d3---83413966422.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/xikexagujedaz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5653d5b851---fatoritabusoneropamonuxon.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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10396 bytes
SHA-256: 6d75be77e0bf2f4e254deea48009591f3340b6132317d98799f45a5472b210e7
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 17168 bytes
SHA-256: 49348aeacfed8f2c4a9dfb15453b5a0565141bc563861f86b68f0abca82d7643

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