Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd574ffdaa4b98ff…

MALICIOUS

PDF

251.9 KB Created: 2021-07-25 01:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c9928800422e0194d84c95b1d46b24f7 SHA-1: 025ec5baddb4debb290c636af690ab8e3a95a5fd SHA-256: bd574ffdaa4b98ff7c4f61c7451e9178e51d46dad0788fc8fa89609a30e908c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate it's designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc680b1fd4---luxuduxufetokekepuv.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/juloki.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7301b565b68ce9ff314226ee2889f471/28722538827.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/55446254246.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/15014090752.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/6675851360fb0d9e19836.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/64bdcc35761ffcfb9d98f6444e54dfd4/xedebufimuvusef.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/37449794094.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/82daab300b7062276fc9d4ded01747f7/vumalakezo.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f1e5fac21f29364eb46ee2f2d31bc217/63697246638.pdfIn PDF document text
    • https://amblamy.ee/upload/file/sikodurolovesololizijufo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82051554935.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/vigetiba.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eba5e283f---65973449167.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd640cc3c---32271681174.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/33561448187.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62520941994.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/josixoxegobalutuluxuzo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160825fcb20561---27000808357.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/95717783890.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e1fcce098---voxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=left+hand+of+darkness+quotes+on+genderPDF 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_off00037c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37C52 10788 bytes
SHA-256: 9c35851f5ae918e6e0b83b87abb47f0ef9ddc2e12130cb90c2bae51a3a4b3c8c
font_01_sfnt_off0003949e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3949E 19552 bytes
SHA-256: e7bef3a71ca85d0e91410c32d638514083b1f7cb0b63aedd6adba03a641561a3
font_02_sfnt_off0003c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1