Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd2d8e1e114ac1d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 11:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0170bd056f3d002fc86ebd6f0fe4df52 SHA-1: 5c9d0f4e850f82a9e514424f7b909c1d7a5780a8 SHA-256: 9bd2d8e1e114ac1da67e4621a1dbdf171f81f1e40e754933684e92cd24eeca50
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jusugerapekeximafineve.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ecdaada189563fccec8ee396b05c0524/jipexonevaxosegomeloberuv.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26cb5847a4---robipaxol.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/27016319161.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/joneximajefujekemituf.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0049d77c3---vokoba.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8bd28e04aa6ad8247a3ea8af7d37f885/57934618791.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/42396097657.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/kuxusatiratelirerifofuw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612d2c563d2a3---mawebobize.pdfIn PDF document text
    • https://buka.ru/sadm_files/39293899450.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106602eeddb0---60258835711.pdfIn PDF document text
    • http://splogservice.ru/content/file/23154823865.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974c538ec05---36494874730.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/28374714996.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b8e10062---vakalusanorinupapibo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d87a80a7---58883493571.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/98259987588.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/dawajukalofanezapesazewan.pdfIn PDF document text
    • http://bociany.sk/media/file/jozefa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073856b9baef---83140133221.pdfIn PDF document text
    • http://clerus.hu/files/file/tasinagasivebadus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=car+t+cell+therapy+review+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a2feb38437777723b9d6526acdba9c7c/84721956678.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_off0000c27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27C 17500 bytes
SHA-256: b1a4d34c3ee33640fe0cd762538542941ab3e5611cace15e8a7297ddcccb8dd5
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10620 bytes
SHA-256: aec4745f6da2536003decb6414ec9228d6c34f699282199669d0fac031aed3d5
font_02_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1