Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcd2daa533f2dff…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 13:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c4ee85754d715d585c28f35cdd8f0b17 SHA-1: 3dbd9245a58e39613eb89634f8be575fc08e77be SHA-256: 6bcd2daa533f2dffe073d2144f6b18fc76b66c4afc34d334e6dbc457f778b200
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tepatsasaran.com/contents/files/56275870074.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dexabutugavipan.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/mukegemubapejisiwumenuza.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b036162f0e---vifisato.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/17517149037.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/domisonokevudolasibum.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/58224505645.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/27302057166.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/42905006832.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xepupijilanesegupejorino.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141530ecbcc2---pabakuwezobutudurimag.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/38239185859.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/42724001302.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/repexe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ga0hha2kg6vgrpl5v1llq3barp/21659197893.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/77532621455.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/98913633413.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/15797067547.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/55984625891.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134067334fa4---menagitebibafa.pdfIn PDF document text
    • http://lg-palette.com/upload/files/65112504201.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/kudawusulajutuvowino.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/pogumuxutirukiriwuwama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=harvest+moon+friends+of+mineral+town+apk+downloadPDF 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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 18860 bytes
SHA-256: cd320d14f0e74c376e04345d6dfd12db8d5039111b966e22a4f8b9085f6e48e1
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 10892 bytes
SHA-256: 8b891e889e76dd882c057365d4ee85afc13818bc36aad323404ed554772598a7
font_02_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1