Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda5210f2be63889…

MALICIOUS

PDF

76.3 KB Created: 2021-08-31 01:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b8bd2b45927e94c91c79ad659d49ba8 SHA-1: d90cde7ca6bc8082f92364673cc47ad3265f2be5 SHA-256: eda5210f2be638890e8d9d8ee8d39159a7289803565d749ecf13fbac43e81b52
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage. This suggests the document is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jirehenl.com/userfiles/file/311452509459.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9a8726ecf475d5c0fb5607e7022fd4ed/pininexiwegufuwivono.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9387958a3---tujufenorekeforomipejo.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/rg8e8p41pkrso50e0p5qv5mbhb/96060146871.pdf
    • http://uzks.hr/upload/datoteke/73789208681.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afba6067614---41998463010.pdf
    • http://bygreenpure.com/userfiles/file/zereva.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a9d333d047ad9dd143730699fafc2f2/dogekujavutaze.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/387442631e38600a3b6d35e921814e0c/zapivuf.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2rl4p5c9m20eh411vp338ld01d/43788703511.pdf
    • https://foulardfotografando.it/file/remisimikobob.pdf
    • http://allaboutdowney.com/userimages/23449823210.pdf
    • https://shrisaiexport.com/lightspeedweb1/file/wukoxidoxitaduwugobiwi.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a12a3e60e---wexozigumoladakubixex.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f605d86102---68133512445.pdf
    • http://pierrevillers.fr/mairie_files/file/gitexot.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6262806a5e---bipefafomesajebofafami.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/29415916225.pdf
    • http://hcvitamin.com/webroot/img/files/nirofezomafiwogidoga.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/725b5a961cb636b7fe018f2963d750f8/sifokukiroroga.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8d06bef7c4---depimebenavadenos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=popular+pirate+songs
    • 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_off0000c899.bin
8d288961147378fd898087b89ec1e905612eb1189bd2cb752eee46ce405ed2e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 16268 bytes
font_01_sfnt_off0000f260.bin
ffaacd6d8ee8b8135d7c8db5cbd4808636b21565a21db22da319bac5d5839f61
pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10528 bytes
font_02_sfnt_off00010a83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 16792 bytes