Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fed42fa7406f647…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 22:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5aed0f797feb99baf3e2c8136a7b464 SHA-1: a830c85940567dac8944db1f9fa65e444d0bc55a SHA-256: 3fed42fa7406f6478aa8990055e40dd5ee95d60137ef46272567f835a1856a7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a link farm and the use of UTM parameters indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=adobe+photoshop+mac+torrent PDF link annotation
    • http://vitalchurchesinstitute.com/files/file/55930348169.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/93472456365.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/xanodanaxesavefozof.pdfIn PDF document text
    • http://serting.eu/userfiles/files/mufopomovupubafazulewaloj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc9e9ca35---63411037390.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/59125110409.pdfIn PDF document text
    • http://inistor.com/ufiles/files/4568845474.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ca1e2551---bagul.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/subowefedutulavobavuseg.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6f665ec973f40c379b02752c001b3090/23550116496.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/25lpbfksv6vggc1ub38ugqigt7/90847503597.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dobujuvupegogomiju.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/70867869015.pdfIn PDF document text
    • https://ccskin.com/geektic/files/purixobagenawobib.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/kuwuferirigapaxabasunumuv.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/79630871814.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/xawugozabelo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108f639e0---sokifumatavig.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613321659cf72---9540387791.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/laworug.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_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 10764 bytes
SHA-256: a392e76e91f9aa2ddc531df7f2af92a8e9ca174d3ebb5bcb15029be5614aad75
font_01_sfnt_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 17656 bytes
SHA-256: a7da64fb8ceeda9c2e66a32d417c7f3c00f291d116076722018fd4eb27e87edf

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