Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4968fb32868302c…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 12:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a04b785f9e3c467be3ab490571f625e7 SHA-1: 5fc481d927505f02728303a45536a0130b1de2ea SHA-256: c4968fb32868302c4ebd1aec102be6c5a98a6a57787c4f59b6bfeb7d7e4fbe82
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. This suggests the document is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b98231a96b8---16530809360.pdf In PDF document text
    • http://emannsltd.com/userfiles/7357314927.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/vofanef.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/20200755165.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/jezagoxipomet.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/dusakibos.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/boxavefulur.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ed9a590a---nojupo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8909bfbdb---84504014215.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s3lhmjlf8ht03gm2t7r0lb1q02/vabuwu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e57cbf0920---zepem.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/7482071269.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/49665219478.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210803025740.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vigon.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/lebexovuvaga.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114a1365c8bd---33588518577.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e657fe319ae---muwonirudivibizeberiko.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6206171b---gobokex.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/xererireforubowa.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/nipenufagasedopefudotiged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rule+of+72+answersPDF 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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 10416 bytes
SHA-256: 4ec79558cd501a7d23d529f7f934f82744213fab7d7b5674d8cd480e8bb1aaba
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 17588 bytes
SHA-256: 8e98a8cd7b003a00572530f01aa0d7cd3e5fd685f7741e0af001816b6c935a22
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1