Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8692f9461ce647…

MALICIOUS

PDF

81.5 KB Created: 2021-10-09 20:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b3470d5babd6dc75b371de0cd7ecd7a3 SHA-1: e888f700c2fb393e96407dfc3c3917a96ac0aaa6 SHA-256: ad8692f9461ce647db5903134f7e8040221951cca25701314b14f45007879c9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

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://medvor.ru/uplcv?utm_term=coast+bar+and+grill PDF link annotation
    • http://zenkatsu.dk/files/bigedenomi.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/95684048889.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/412d23ad304e4de0ed934ac4d03ba004/72396307960.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/zanajabuvovewilotosiduve.pdfIn PDF document text
    • http://osayit.com/images/file/laxonoladirizadaguwalat.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kozumofunorawodolow.pdfIn PDF document text
    • http://htwy.com/upload/file/winizamosusamejabedapega.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tibuzojiniligizisabux.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141acca4db7f---lokexaruvumifaxupiz.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/zonofomaborigu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/patejunamurakijexafuj.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xinosemutamo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb99b86edb---sixowoxovibumowe.pdfIn PDF document text
    • http://potlista.com/file/files/56527544476.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/29109410751.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32236166130.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/tipusalugodoluneludixaf.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/gotalidafuzosom.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090500564673499.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/89589969627.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/wuzejiw.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/7634784294.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kuroka.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/wawiwe.pdfIn PDF document text
    • https://oferta.lt/i/File/lizojimusoraroku.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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 10464 bytes
SHA-256: 01f7b0414b8bb107a789b1144e1767e5e1854f0f740795411a7fdbbd91a90e01
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 19508 bytes
SHA-256: 94deb2d23c6dbe0406a624406caf23f11b7e6923a1e11fc6845c1dc587852267
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1