Malicious PDF — malware analysis report

Static analysis result for SHA-256 a874d416e9aefe30…

MALICIOUS

PDF

92.6 KB Created: 2021-09-18 04:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7985b32c4eb45b192118964c62b48e27 SHA-1: b47de35f228f7e0b586fffc24dd1834c5a77f255 SHA-256: a874d416e9aefe300c283aa765c6015d629f867df1cb15a36a6eba95a0e5d1ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://myshalewell.com/userfiles/file/83538902886.pdf In PDF document text
    • http://ilovehikari.com/uploads/files/96026616572.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/60090369606.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kovorejuvijukulavor.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18dea1c33---debawegumelewenutitalole.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/3786930454.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/84340954694.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109131019395308.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/pegum.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/livisotusuzefupimomo.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/13417706726.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jasur.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/80534586283.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0cbd3362995ed5197cd714bebe8596f/tariwalumewidad.pdfIn PDF document text
    • http://plncse.hu/php_data/file/22502023165.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/wironolugigutituki.pdfIn PDF document text
    • http://sparkpro.lv/content/file/sujukix.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/70905594089.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/satanemofudorizozurow.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/mibijul.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/palubofawuseresulatus.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/vebozelawewidijakisofap.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/73564880023.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/746ae7bd9341c3fc4b28802c6ce5a81b/7937536993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=latest+movies+2019+full+movie+englishPDF 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_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 11144 bytes
SHA-256: 6f67de2300e9c06f5de946f2da14a78aacecece8797ae203ab3712d1c10cc801
font_01_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 17228 bytes
SHA-256: 3b6ad1d15b1b2c2b450edd760113dfa4448a8c350c751d42c3d016ee0e6ce35b
font_02_sfnt_off00014c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1