Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c6567244714977…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 09:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf694fdaf4b0abe96afe37e2c016096a SHA-1: e4c0fd2ebbf7a040b0f17c79c9f708567938ae3c SHA-256: b4c6567244714977e5768c6ce562e878b1a7bd1523fa5a9e350bc3d8581b9396
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/14d1605ed0a00a58890e1c7feef43d21/vosina.pdf In PDF document text
    • https://ever-progress.com/upload/files/wepaputazetatib.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/wudoziramogaraxoda.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cf9f464b1adb1c3ddc2f036faf1b4003/sezezuzo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/6462561433.pdfIn PDF document text
    • http://djpress.pl/Image/files/6475171722.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/21820834010.pdfIn PDF document text
    • http://farashimirooz.com/files/85906758916.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7d070122---19822366288.pdfIn PDF document text
    • http://cssh.es/img/file/tumumumazuxiwu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23b11cc53---92394957991.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/47855040770.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54e70a147f---gotaboxajop.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdac73e97e---7986113258.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7841b23a78397c8b41a63b40e9379132/60169790583.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/retalisodixowen.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/zoxodikatimoxunavipapa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fa60fa2e---49805661188.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/69134031135.pdfIn PDF document text
    • https://kawanmto.com/contents/files/tixupikiratibuxonizexi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a6b4efa5fb4bebf29ff2107c3fce1b8f/bavurifogurobefasej.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/japijanizejunubapef.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071a08e85d0c---62363542833.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/63f7bgkkp6c5k5ev20r09i6qos/97159371029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=group+therapy+sessionsPDF 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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 10556 bytes
SHA-256: 79d21b8e00a9d681133d79cea93b3435276563bd575108687f8c65a4a3dc960f
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 17356 bytes
SHA-256: 0c01b10ab3985ffcbcd0d989a16d710dab0e5d8f14369e8f2e11f9b983fbb21d
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1