Malicious PDF — malware analysis report

Static analysis result for SHA-256 5974a5c61047d53e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 18:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 850d2df54fc6e2f532127be5ca9ca66f SHA-1: e073879faf0235f53c00bd356e00d5b1e0a8aade SHA-256: 5974a5c61047d53e6d31a87e7eb910618947d6e11994425bd5b0ddce2c4e56db
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. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS upload directories and disposable hosting. The presence of numerous links, many with 'utm_term' parameters, suggests a phishing or spam campaign aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j55sudcbg4eb7l7e6k9nvab547/65482925768.pdf In PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/90847967607.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb23cf586---11814851195.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c08851d5c5---varago.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/96379013132.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/91085003778.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a435579c---nelewaxizosuxumajoxuwumet.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/texezibozinirebumorimi.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/nazevurina.pdfIn PDF document text
    • https://mentormedya.com/files/rovavodo.pdfIn PDF document text
    • http://teakdeck.pl/files/file/35343636121.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gekiwoliwokivekar.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/51137180631.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/susolemivalo.pdfIn PDF document text
    • https://eetravel.net/file/nefagitujatomozatibokusod.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7fa3dd6fe92fb959786be631dc7c1aa1/55587320238.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/29264671477.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/savasugolijolopemenamak.pdfIn PDF document text
    • http://jar-ted.pl/file/viromu.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///76242877089.pdfIn PDF document text
    • https://sanidom.pl/img/file/54050261166.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161335e73548da---furebemotoguxaxaziwi.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/99349477722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=telegram+call+groupPDF 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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16864 bytes
SHA-256: b8dd8d0c5c6316bb9127822854502e71531ca083b1054b6b666e1834f672582f
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 10316 bytes
SHA-256: 44e8366bfb612980306c76dbc86ed84cc083b9635b7b589ca82b74553bff6514

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