Malicious PDF — malware analysis report

Static analysis result for SHA-256 9608334ec4c0b157…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 11:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e395a382a3203c788f021bfaa0f9c36 SHA-1: 203d6eb6694fb35f888bb1ac35a46ce22c91e2c9 SHA-256: 9608334ec4c0b15740ae9c644d0d33626d1544c41f65ffb33701273497f349a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links that point to various domains, many of which appear to be part of a link farm hosted on compromised or disposable infrastructure. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=jazz+dance+history PDF link annotation
    • http://rickgrisolia.com/userfiles/files/karixowopojifimage.pdfIn PDF document text
    • http://surestegc.org/documentos/file/69196037810.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163174274691768919434.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/ramufa.pdfIn PDF document text
    • http://zeci.nl/im/image/91311092202.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/tilekolakepezu.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/betareretulosobigivuvupi.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/jexuxoror.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/38376123462.pdfIn PDF document text
    • http://sissonne.hu/editor_up/63238127782.pdfIn PDF document text
    • http://veitali.com/upload/files/53003460036.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/genabaxena.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/29327931712.pdfIn PDF document text
    • http://master-vin.ru/files/file/demobabakafotusaneke.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614038d062f07---7532998847.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/18836740701.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/91829672673.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/76325380613.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614822526fc1e---25311010895.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/15444936296.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/13769590606.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387535e6162---27568457703.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/17534954370.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444e947f1ae---61895794923.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 10588 bytes
SHA-256: 4676b7f1ce1896ed0f8b79d5d92fa7fb73ecef73e2235027956594ba0f482fec
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 18256 bytes
SHA-256: 79225f317231ac68b9c030732b4f017f9c6faa716571b6bca725405b7b391fa6

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