Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7a09eb5f4f57dd…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 05:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87b54b134663e78c7a445df5468ae97f SHA-1: 505466a7c6c0cc1de6fb981dd1fb19df93472ed7 SHA-256: ad7a09eb5f4f57dd8419e662fe6e0e6ab29861baaf5c76b9cd6d97a967685d7c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload directories. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ee92aa902f52ac8b695d441227ab32bf/lufud.pdf In PDF document text
    • https://regiefranchet.fr/userfiles/files/10794734840.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/jaxomojenuzuful.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/bavekamimubokebevoju.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/dizetiguxuj.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/98358550586.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffa3eb860---81321319817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7430861e---tekibojiledonemukal.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baaadc7ff3---pimulifon.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wakifumiwox.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/sifalatetidawerorufapitud.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/23814728829.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/53098759755.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/vuwadagazarukikusararovux.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xamoseboza.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/votujebewe.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/rozuxopenosapa.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/teraduwawurivitarabo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133492ca1247---kefujigafitotez.pdfIn PDF document text
    • https://flomogroup.com/upload/files/1496073494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mitos+team+free+fire+v20PDF 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_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 10524 bytes
SHA-256: b80cf3c3beb136a464447ac22170c5a91346350d0f4e2d6f5f9f097b4c71356b
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16156 bytes
SHA-256: 1a48bd10845855d26b5107f7fef133c421cd85e603e529494735c12089d38fd9