Malicious PDF — malware analysis report

Static analysis result for SHA-256 861fdf49a38eed1f…

MALICIOUS

PDF

96.6 KB Created: 2021-06-29 04:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28f7d5a5c9baa62df5f4cb5acbf4f477 SHA-1: 5637a0659946b19e1e2ad018f7d40ed716d35b32 SHA-256: 861fdf49a38eed1fef9726d8cb82e50ba0bfbbff05c33cc6374fe29d758a7b71
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns are highly indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://chcial.ru/uplcv?utm_term=let+me+live+meaning
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb02d94253f9efffd7e8bcd2b500cb47/vilidumosagexu.pdf
    • http://rajskiewakacje.pl/userfiles/file/51917610864.pdf
    • https://dlt-nkp.com/fileupload//file/88912893607.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8bcaf850---90830575402.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c939f93a5e4---52531526673.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9401cf3ae5---zipifek.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5c5a843---tuwivekudetidokevu.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rpr93sb2ltbsodahnnt1c9io2s/36288806886.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/984d489d7494ce4d9590b42bf11d9e48/gatosokukefa.pdf
    • https://skinrepublic.vn/webroot/img/files/roxixewawalakijebiwe.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b02d85d6---25204139796.pdf
    • http://alexhoffordphotography.com/temp/files/file/fukeju.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef09d8eee---vudetunevawebelumivi.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3d1a126acfc15b87b6d7ef207f6428ff/xufukomujuligaxidasujoro.pdf
    • http://springbook.no/files/bezimisoto.pdf
    • http://villabrown.it/userfiles/files/kesupisadepux.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/toxoj.pdf
    • https://akproauto.com/nbloom/fckuploads/file/zipuf.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1lce6qstj5u8l21ogvjk7f6292/zupiroriduxelonapi.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/85c14ad6486638494f088b59fd9dc77e/nejefubivenaxus.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50139f2e0---wuvufejesatuxadotefojo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52812ba6dc---11186938214.pdf
    • https://bestofbucerias.com/upload/file/luvesinatimezinepekekuv.pdf
    • https://vibangthuaphatlai.net/uploads/files/xivabet.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2c.bin
d4c2b9b7b7aead73366a83ff1b4ff6f931e41b1b26d22c37fd6dd5a474c58c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 10088 bytes
font_01_sfnt_off0000f493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 16792 bytes
font_02_sfnt_off00010ca4.bin
bff46227b2ad895bc95e2076c61908930959136b667d1db98093d283abf7cba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 17356 bytes
font_03_sfnt_off00012695.bin
aa1276c5b31a2caa617f22dc19a583ae64bb3edf540b3dd528121d2606c39700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12695 10052 bytes
font_04_sfnt_off00014697.bin
b44c8aaa591387df39bbb6d3690d685cc623ca38dcd061eb3b75a6e4c05d927a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14697 17728 bytes

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