Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aa466e499f1958…

MALICIOUS

PDF

103.4 KB Created: 2021-08-18 13:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd65402ef10f204596e9ab7baba40d97 SHA-1: a7fd89019a3b6e0c0593f6cf7effa40c41ac7583 SHA-256: d4aa466e499f1958674b4fea44877e294e552613f755e52fdc979005b461e9e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this, likely serving as a lure for phishing or malware distribution.

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://pixomot.ru/uplcv?utm_term=%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0+%D1%80%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9+%D1%8F%D0%B7%D1%8B%D0%BA+1+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+2+%D1%87%D0%B5%D1%82%D0%B2%D0%B5%D1%80%D1%82%D1%8C+%D1%88%D0%BA%D0%BE%D0%BB%D0%B0+%D1%80%D0%BE%D1%81%D1%81%D0%B8%D0%B8 PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161071e92bb9ee---dulukupin.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b9a299fd---bufudepavozej.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255283ad52---pawamuxanu.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/nuzali.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210708_D97E58BF37A115A2.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/37138190321.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/rilosedisiwezilojemin.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lofidapid.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/dodisapinifi.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/50902098664.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc38eb964e---sapowovew.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab5c3c6ed---dikurigovibajifewejoruge.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/44bf7c791acc1399ad14fe7a153362c4/46837530404.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/rezepixokogotajudogapi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/paruzog.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/75605271366.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5dfa190ae---4465417021.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d217d06cda3---dijuworuduliju.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d80b2da210a75b52c33944c8e42dd737/38187723475.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/caf36444fff741c0526e27a1d5f71519/tazirirereg.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/85504172336.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/40388283689.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/61817907755.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/safugajemanonuguvutesom.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/94363614067.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_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 23568 bytes
SHA-256: b560643f5a51f82a2b15155fa13b66cf947d72c1f855b9c8c0d94b9a6bbad109
font_01_sfnt_off000156d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D4 11700 bytes
SHA-256: 2dc6613e5fce7d1d73125626359cf4e48e751b321f84401c17686f2cb9a73287
font_02_sfnt_off0001723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1