Malicious PDF — malware analysis report

Static analysis result for SHA-256 0101bacdf0b31e32…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 09:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd3cfa958d3519fb390b4f5725a7c9e0 SHA-1: 9924845c050d99e44c3db7235cce48daa7020a23 SHA-256: 0101bacdf0b31e3204c2dae8569319a1a4887b8fc2da79db7a895e9485a253fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://martonaroniskola.net/userfiles/file/rakupogotivurexotim.pdf
    • http://trungtinjsc.vn/upload/FCK/file/78755057719.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670f39e4ea---podigugubasoputepelofiwod.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a815bcd6a6e---43891321479.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9998f512---dureku.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1503e8c43d---61127362370.pdf
    • http://chinajnbt.com/images/upload/File/96617810683.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1cpqqju09v0bn1qa3j60o88vu2/56522678726.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088b9d5be703---95053875724.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gfcr56657fasneqiavfls6qluj/kefozobajigeduwedofi.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b0badfcc278682aeb38a33a59eb68d77/77785412773.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc087e491---22590729762.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f62b98aa134ea3f103718a0767861ced/55731191910.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/62567772453.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9b02c4e5f1d6b36a9ec29de80454b32/3894110667.pdf
    • http://luckdidea.com/ckfinder/images_store/files/80747945080.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/55062646994.pdf
    • https://armagedonspedycja.pl/files/file/bivebidopukezovakezogal.pdf
    • http://ambulanceservice.pl/userfiles/file/75643349029.pdf
    • http://gernano.eu/gfx/userfiles/files/25731717848.pdf
    • http://dermalab.pl/userfiles/file/nevixuwisoposavo.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c3850e7c---7940746382.pdf
    • https://paperland.bg/uploads/file/deladutejinupuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=interview+questions+on+javascript+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a8127e83---51044942569.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_off0000ed5a.bin
ab43642362768e77e60144ede495ecbae1049c5d1f1386ef8555f7e31774e29d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 16900 bytes
font_01_sfnt_off000117e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 16792 bytes
font_02_sfnt_off00013000.bin
f60e32c9de193a5a05c0fd9355bdc58a7a0582c0ef569e3f03961658d897f68a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 11048 bytes