Malicious PDF — malware analysis report

Static analysis result for SHA-256 c042655e937309c5…

MALICIOUS

PDF

98.9 KB Created: 2021-09-16 05:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 163dcf7b8a4b9ab460c1672f906bc329 SHA-1: 04b0565b71098470a84343c15cb7baf79791241b SHA-256: c042655e937309c5a2f44085f4378c444fb0c37f091c9df94492c8c4a2b52ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=htc+android+market PDF link annotation
    • https://angkalaris.com/contents/files/57490257795.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/bonulonagap.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qnpllcjla3hdmvu4spe134jpc3/gaxupuzo.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/gefazepa.pdfIn PDF document text
    • https://digireg.at/upload/52850889434.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613634c3d28ed---benami.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/musopige.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916054509.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/58554001747.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/11917937566.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/rolajirenurukisebo.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/rivikejim.pdfIn PDF document text
    • https://websbag.com/uploads/files/59780650885.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/6606154943.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/30215487022.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/rogivaxazepudarekoka.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/5418150216.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/daran.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/98635038090.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/52378906174.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/11944171545.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137510e13ed7---28352299163.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/67732069863.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/zuzajoxalajigejapo.pdfIn PDF document text
    • 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_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10400 bytes
SHA-256: 084e61617af8783ef6ef3d5f3bc3f94bec9f37287635a2856fd731d6a88f139b
font_01_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 21212 bytes
SHA-256: 88da211d60e1c95412780ef998b60be71c06a577e88767d6767739a056e2ac57
font_02_sfnt_off000165d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1