Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92e8d9d7a174b48…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fd2c02745c0b3c22c06988c6a6614be SHA-1: 5b0497cc84c1a930352d44d7f6a461fc7c9e96a2 SHA-256: a92e8d9d7a174b4894993b8d5d22fac6c56eedfe283aa31bb44676c4cd22ece6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=xposed+no+root PDF link annotation
    • https://megashina24.ru/files/files/repuli.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/78747012018.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/49245590720.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/85813734143.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/11a3f29acb5e82439d342c3c0900aa51/58654462862.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/153603360861357d74042fe.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/49494669059.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/93105259617.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/8733973290.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xizugitotokibulaperab.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/34883755957.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/12904332811.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/vofewolujov.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/23849008626.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134d01e23724---jisolefonudifasidunef.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeae3c9df8---59627895392.pdfIn PDF document text
    • https://biocoils.com/img/file/9902160442.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/vilawanogexe.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/52889596792.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/forikejefexoluritibujo.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/73342533579.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a2eec927---xowexanexivawomek.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/53875045359.pdfIn PDF document text
    • http://hidramaco.com/files/files/rekunobutetaxaromope.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_off0000b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 10092 bytes
SHA-256: fb285ba81e50f9741f0e7d1088377359154cacecd3c15440bc08668907c1096b
font_01_sfnt_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 17668 bytes
SHA-256: a85e55fa9b2f29cf5616268567ae23082f047ca44b2920df462914819d56e208
font_02_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1