Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2181655aaae911…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc6c5ccf567e7f592c997e13464cb207 SHA-1: aaaf2f5cdb9985022965d7220da54fc2bf0e08dd SHA-256: db2181655aaae911a46bf58c0585e5e15e9461d523de6cd9dd476be7bcfb2880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many pointing to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the link farm heuristic is sufficient to infer the attack pattern.

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 http://healhumanity.foundation/userfiles/file/tozoxofuvapa.pdf In PDF document text
    • http://massvt.sk/editor_uploads/system/files/25164513914.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/25287869426.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/ruvikubedewilozon.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/babovufa.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/60749563277.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/43681512988.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/22658298537.pdfIn PDF document text
    • http://fnathservices.com/upload/file/14143160874.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137affd6a146---79703144127.pdfIn PDF document text
    • https://coil.hk/upload/files/buvej.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76667846798.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/4838037683.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78052875068.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/7139292509.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab3e41146---dojagunezepul.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909110500.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/42368498371.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/sepuniwedu.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/51069244559.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101c0315be---vawaredokejir.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/junarura.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/54129267490.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/23974636969.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613758f5824fd---wewozeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ver+peliculas+en+espa%C3%B1ol+completas+online+gratisPDF 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_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 19316 bytes
SHA-256: 8435fe92e7c7823c68deb602377ebbcaf33b89a6a193cb1c99130654500de39a
font_02_sfnt_off0001310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 10992 bytes
SHA-256: b406b3119a8976a0b000a58af377d06c5be61c12e9352b668044c2582ceb5c9c

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