Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44150620c38ddc…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 07:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2763f6f2894a077a9584f9807ed8aec SHA-1: 115c95b55fa3b492f9edc078a26d2d9c03d6cf16 SHA-256: 4b44150620c38ddc299b1a18dd5a382d901d54f761114ad722e29d8ce67ac40e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=body+for+life+challenge+2020
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fiv7172vlu2osm1cfuh5q0pk1v/6598232281.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bapixifoporenoguxad.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3220782b62---37006574293.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889617abab6---rirexirigedip.pdf
    • http://asustainable.com/global/file/38585748975.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68534f9f6---56519225731.pdf
    • https://auto-rujo.com/images-editor/file/dosajebavata.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf799be3c---32881341996.pdf
    • http://ninda.vn/userfiles/files/tejotinegijumurakukam.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/oekog0kab83thgfu72p5pa1tlh/gubujezigoragipud.pdf
    • http://nsk-nalogov.net/upload/files/9320932958.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca24d0f22---35342948306.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/fe4b7e1201acc259fe4aff7eaaaae7a9/pijexu.pdf
    • http://azizolace.cz/images/file/dibitibu.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jq62crq0pnp136rj40ffo09tnu/mikozidoxipexudojinag.pdf
    • https://dintek.eu/uploads/file/dosuxenob.pdf
    • https://fablab808.com/nbloom/fckuploads/file/xuxop.pdf
    • http://denki-shonan.com/uploadsfile/40446954778.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e127e8139---32568564310.pdf
    • http://shinies.ru/img/lib/file/9453805166.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7spdq2lpv2gm58f1d5caa9e026/41200656399.pdf
    • http://voxel-avocats.fr/uploads/file/konopubibofore.pdf
    • http://shinex-auto.com/userfiles/file/82482277502.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/527f5943c3b05e51a0f81931010345aa/85426581615.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faed.bin
c470e43bd8d0dab459bf3e7112954cdbc1f8cec3e6f6ed6b0a8b698fccded9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 18120 bytes
font_01_sfnt_off00012ab4.bin
323b477608a83d96367952cf1bb8e9488045b5d3a27ecebe86a03aed363812d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 10900 bytes
font_02_sfnt_off000143b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B2 16792 bytes