Malicious PDF — malware analysis report

Static analysis result for SHA-256 0037b72e1f65ff04…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 14:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d46f3ae7d5eeec8f6dcfe3b4c3e6d80 SHA-1: 94f7297e76505b26cee1f9b67237be089ff607ac SHA-256: 0037b72e1f65ff04d2b423f689ca5073204d55b636d316d3b867b7389b1c5f43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=en+anbe+enthan+aaruyire+tum+hi+ho+tamil+version+song+download
    • http://tikatalog.sk/_files/file/lavibuxuvijadipavapejo.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/3401593548.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5236431eb---19656712116.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d99d647de05d0dd8d9614f29fdaa4f8/pibopim.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/51712f18ff6dae5d1e9bb4f37a3017a1/22426006919.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2324b9a7aaee21f5aeae2b87dc637e42/32638788139.pdf
    • https://lawrenceyezersky.com/userfiles/file/wovuxitisonekafaf.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ffd4886a---takakezixegugunerepatimid.pdf
    • https://areicon.com/images/file/72128553777.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd96e51b---38912486947.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/fe552fc2878635a1be5920c572ea13ac/puzaromujizolar.pdf
    • http://okmarin.ru/userfiles/file/vefomigevimunonep.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160736abaa75be---vanegisameveminutiganixaf.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607867dfccab1---69813356498.pdf
    • https://powermailer.in/userfiles/file/rovibaneza.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gg9emltongfrhkfgu7nu1ikrcr/45526949399.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adee02d12b8---nilufavij.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84469397483.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace69dcbfd1---sezodunibetulubagonesiw.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09eee1e116d25d7f45565ae893e79d91/nagapenoluvekas.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc780838b---gezekamudutamejo.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c99437820---29682570739.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/aa73671b72bc23f8c9be6ce17313776e/52920746113.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160db958026eff---firajaputew.pdf
    • https://cpsguffanti.com/uploads/file/91461413630.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ea.bin
10adceb617c99ee129c23eb0906bf0e7aa69a4b953bab922fe01fc1ec338181c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 17588 bytes
font_01_sfnt_off0000fcda.bin
0046eac739cc938b2f54ef32e7db13002085baf8b472721fbe3607b2a4809303
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 11184 bytes
font_02_sfnt_off000116ae.bin
64a7877aa91c12d6dceea92dcec3dc475038ff0fa11b41b2be29c80255ba74e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 18908 bytes
font_03_sfnt_off00013508.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13508 16792 bytes