Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4a940e0f04c62a…

MALICIOUS

PDF

93.9 KB Created: 2021-06-25 22:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c152048629290f7fe98d297ee2d497 SHA-1: 8ca7dd12c6ae5b7d3e831148e971e4d60d5b4e06 SHA-256: fd4a940e0f04c62adbc8531a3e647484f4b4bc78200f0081e64ddb1fa17bce0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded links suggest a link farm strategy to distribute malicious content across multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://meteosputnik.ru/userfiles/file/xitafowu.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/s9nai71qqqgs1vsjsgi7p4mrd5/78259144818.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f041a42a254d53d4823a89a82bc2abe0/81885408289.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fce17064e---wakokixiwo.pdf
    • http://playeasypiano.com/resources/fck_images/ragimepobaxijiwedoferosaj.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/emo3urmogfq1bfa4v9hmsgul35/13872566868.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a5745552---47227935845.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/90u9nd4gmri3qq49rfpuucf7r1/dulavuz.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/91952854901.pdf
    • https://maxflowfans.com/userfiles/file/pujedarugekotudoviw.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009f92f1ba---17482954007.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3ec3c353ed75e95ae1f03c0f869eeafe/85379623771.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609923e560f49---bifomided.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6251732d2268e22c0cfa75f193ff06a2/66345157097.pdf
    • http://allaboutdowney.com/userimages/dusovupimelujezudasanadur.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hdmhs6r58v1f4jau8gv72ku404/donigazusujurukikuvone.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075c908698ae---pupexawigakim.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5cf334b8cf9e50724fb1ea5c3aea9ccb/logarasegesekazuriko.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06dd0cdb1---73828786947.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/88715120845.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160770e7e54200---fuwepote.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839de6fa2c---zepekaden.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=my+elbow+hurts
    • 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_off00010e15.bin
dd6a35358f8d5feff523843bc809256580e21069e91d0dfb03b9cd4a851cd7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 17204 bytes
font_01_sfnt_off00013b4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 16792 bytes
font_02_sfnt_off00015361.bin
82e22011b73004b5c97978f23dad73a1b3c407179e5378828aa7de8bcf30d615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15361 10280 bytes

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