Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f58978b12e507f9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 00:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bf0bdc66f30e8009c95887aa3c714b5 SHA-1: 7b7b2b9bccbce05a0b5477a9500941bd9277a9e8 SHA-256: 3f58978b12e507f90ba4693c0db7a8fca0de40c0982b67b6cb87bc6a711ad866
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=ios+version+download+for+android
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e0c78bfba---gisexipemidelaxifabe.pdf
    • http://amandatravel.com/userfiles/file/86833601716.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cac2007dd---nogali.pdf
    • http://unesco-mediain.cz/fckfiles/file/92618454312.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ea82a6c670ca155acc83ef6bfbfe13e1/kabodemodugorop.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4889cc79e99bf21dcd26732248e0a646/94258259913.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2257dee4cd---2980600277.pdf
    • http://thebrownbag.vn/upload/files/lemonafoselux.pdf
    • https://4of100churchstreet.com/assets/media/files/41652444156.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd1d218eb---xogapavunilewidigafa.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba59504b06---kefafarojipuwena.pdf
    • http://gesundezellen.com/neu/userfiles/file/dikeduvutexa.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1af5459a9534c9164db6f3328215ca50/panarilorajuwurewalakag.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa26a7606---12291290509.pdf
    • http://kaupa.cz/userfiles/file/49242488821.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1ff29df0---vogatogigodofog.pdf
    • https://rubenferro.com/userfiles/file/70312400732.pdf
    • https://giovannicaputoboutique.com/file/98416559437.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/falemikusajovutomabix.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094396b48e13---zateniloxoranoko.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd165055b---verepelepi.pdf
    • https://cplastik.cz/data/cms/file/31884951371.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/jipetonebozanaxewuboso.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_off0000bb8b.bin
42abcbfc29c7efb2b3f61d53f72e05e06bb184fe2c3b8a2ef17dc43f02504e18
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 10352 bytes
font_01_sfnt_off0000d30c.bin
4022ce2388c8f5fdbb147e7b84b5e55ce8dc69201451e643fdcbafa07966b0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 14204 bytes
font_02_sfnt_off0000f639.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 16792 bytes