Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8be197e01f13c2…

MALICIOUS

PDF

90.5 KB Created: 2021-09-15 23:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b155fcff3e3986e5f67dba2c28319125 SHA-1: d5d511b9c3a810e3af40facf217cd07d872e2f4f SHA-256: 6b8be197e01f13c2e5021e624e48a80b645bedb0f587586b473eff111f334f1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=top+free+movie+sites PDF link annotation
    • https://digiconelectronics.com/media/99718832866.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/zupodosoxa.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135feb89b742---92168935569.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/dikanetotenajibivuk.pdfIn PDF document text
    • http://dges.in/userfiles/file/jupimovipojavubozu.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wurogujiri.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/gufafepojopunevevivakib.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/84154052476.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/9940881326.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/26120066278.pdfIn PDF document text
    • http://falconltd.pl/cache/file/44016297671.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/14358622253.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/72070193773.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zusuwewuxojawij.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/30126566760.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/61290326186.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/91374579140.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/90239382351.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7a7b2bad15e9e9a5140710e18575c7a1/27121985617.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f470c0af8---zaravixivi.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/xoporefedoravemisojaj.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/sujasikiwagekilubejeg.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/sigapimi.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_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 17228 bytes
SHA-256: d76e548b74788c3276f75dcd69813a42c05f1b392f3387e816d1f3f1a1414e04
font_02_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 10236 bytes
SHA-256: 44ac5815865d2272f0217b1db55e74aa5d83f468f495784a5897f1509a6d9f7d