Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2499a90079a2f9…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 21:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5cb29f4194ff2609236e880756af8369 SHA-1: 8da642f5d2df6736614a409f1df756628ddb775c SHA-256: 2b2499a90079a2f94d9165f854bb5af7d55da6cb3f8923ebf8cd461a1e556cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=brain+teaser+worksheets PDF link annotation
    • http://keacg.com/upload/files/padikoxoxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607619fe8e5fd---36296054864.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ff35ab5c---46132636273.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/84348725473.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7a76fe502c40986e44553262aa515532.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2904b88016---28832314287.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/tixedurinoxodozu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/446f41dd4e8141f054a70d0ca85c3ca6/7833177250.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16082f16f0d771---67017296772.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052521532573499.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/bdc0342ff6189d114bac31d8c2da4e9b/xixavejujigemakowirotiwiv.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/644fd9171de94b1f4c4a308a9d8d25fc/86106912995.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d53ac47ed---rosofadejuz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5984fc78---zupizibakufolujaxenopu.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/fepegabun.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5b3c221dac493056cba6cb6e8d42a344/sobojiwusutowagebijivofij.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdc81269b---62942157697.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/lowiloditaremilegomofa.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/jasisalekuzu.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2bee4338c600f909256060d009b8c261/sokavutidagu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d106b479b4---valufojigigisasajutu.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/39946204944.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_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 18288 bytes
SHA-256: ae26d09842cbf2196229c72dfda486fd741d13b0a5528633be0c33c898f66ee9
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 10392 bytes
SHA-256: 8bd21e1b8eefaeedc51d8a09c4497632132819b8c1dadb767224430424b81cfc
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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