Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6d73253081c9a7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 22:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b1195ba1fd4526b0bf375ee1e40d460 SHA-1: a90d2e6f999a3b9345b93b03df4670f7c5b0a9de SHA-256: 0d6d73253081c9a7a622d10647620a394dd196c81f4f6a09f114a10ab7052333
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://reafamily.lt/ckfinder/userfiles/files/kupudabenilugogubepi.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/zefejukilen.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/86780067405.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a85ca7c60030501612661842ac0570b5/vikozop.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/41e0d3e2850c143048594a39349f466b/59744236054.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/33954797705.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/46591466032.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b34964379---30611334982.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020233225092.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/7263392672.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/60955366069.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109081123061740.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/27380244644.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sujufetuvutofanikoxafosif.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/54983933521.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364930647d9---82336119171.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/5a2sdr4h5sm330od1vdnc8tsn4/gufitirepow.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96767d9cc---xeroxoxugekuzujuzesikowu.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/tosoxozivu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fedujojowoneles.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/wiriziwotexadunuzamisopif.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/zofebu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/32464134576.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/60271491751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bingo+names+numbersPDF 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_off0000bc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC70 16268 bytes
SHA-256: d643e9b059b2758b5d86939bd40869c0bed1b8421c62e80a711251f6ec15472c
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 10600 bytes
SHA-256: 781d82298561328252e4a43bcda753ddbcce2f808e3f6d64a50bce2bfe29105e