Malicious PDF — malware analysis report

Static analysis result for SHA-256 391e58573e3d4f1a…

MALICIOUS

PDF

86.0 KB Created: 2021-08-29 20:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45c45866ee68175135cbb3a5d90b9e08 SHA-1: 2256e36dd1767d20bb276e47776db578d4a382a1 SHA-256: 391e58573e3d4f1a33dbc02d2bdf4fbd125b0e6da18db31fdecdba45e929dee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a10152f70---97621124.pdf In PDF document text
    • https://delcinfo.ru/img/files/files/71636363646.pdfIn PDF document text
    • http://gibisch.biz/files/files/44334651858.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/th5vas7cvd455f1n4tch286ct3/kamizuduvumofofetupi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/ludofomazebazelog.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154943f35dc---30690745948.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bb2a57aa9---43492728105.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/98984766767.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85b3eea9b---wedidanaferesufutenikul.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f970262645---wobalalesudonalepimiviba.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/wafinokawexeloxarul.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/65631561655.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/22786643885.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/579cf38725907774ba4d3229f3fe9a73/fapijawuj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e33042a---bukajoxubojelu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/kovivegotadobu.pdfIn PDF document text
    • https://agermag.ro/mm/file/bisuvuzidaxivonomijuruwi.pdfIn PDF document text
    • http://dges.in/userfiles/file/85958295507.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/1hbnu195t0c7pkpj4mpr4mij7r/sakidarar.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/20562346125.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a37f10db940---banuxukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bloopers+from+the+golden+girlsPDF link annotation
    • 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 18528 bytes
SHA-256: afe094d8c8ed06d362516968ff7d0cdbae76c969ed2c80f8ce3b781fcada690b
font_02_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 10836 bytes
SHA-256: 98b6cfef388dff724cca3f4de40351f9941f315a1978435c6682eb416ce9b165

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