Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ee4bab8b8272cc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 00:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09445b32b94110ed1aedbc9dba08570a SHA-1: 19a76fdec550efdc6050faa8493012e0dd1aedda SHA-256: c4ee4bab8b8272ccdc6dfa4cba78657d56ebe36bbffd8347f329018142b4a439
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://dade666.com/userfiles/202109file/2021090704323170554.pdf
    • https://fedico.ca/upload/editor/file/welemenusazukunarilokedu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c8f1f604---gixowumumumafajaro.pdf
    • http://sochisushi.nl/survey/userfiles/files/kawimebuwedo.pdf
    • http://pttaccounting.com/userfiles/files/tavumos.pdf
    • http://yevres.fr/ckfinder/userfiles/files/84621602563.pdf
    • http://jarosi.hu/files/file/boduzapovexa.pdf
    • http://coyada.com/up_images/up_images/23105434919.pdf
    • https://doan295doson.vn/namthuan/images/news/files/kojalosikelozixu.pdf
    • http://www.asap-recruitment.net/upload/file/23783609804.pdf
    • http://hoteldanang.vn/uploads/images/files/roxowetumoloxuwe.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613688c49f4c7---77348826970.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613067d10c5f3---84080856831.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/widariwe.pdf
    • http://transchem-tech.com/Uploadfiles/files/38997089044.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614715616b961---labapak.pdf
    • http://kapsalonindex.nl/images/uploads/gavinoda.pdf
    • http://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdf
    • http://peoplefineart.com/assets/202109/files/20210901060824799055.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368f29ebe14---bimowutabofema.pdf
    • http://szjglaw.com/uploadfile/file/2021090710514373499.pdf
    • https://juvelyrikoscentras.lt/Files/file/42371836735.pdf
    • http://52963566.com/upload/file/202109020520269461.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/xujagered.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+godfather+novel+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16792 bytes
font_01_sfnt_off0000ffe7.bin
5441260c696642a48a5441d1a4448b3a8f7b28af462e9d6b4cc6b30e7c86c278
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10548 bytes
font_02_sfnt_off000117b3.bin
67508eae5af788b188298ef31b5d02f7c9b58f41d1e23aa0e652be271b2b95f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 18448 bytes