Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c97258a7d8313d1…

MALICIOUS

PDF

95.9 KB Created: 2021-07-08 04:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3ae66d590557d520edeff04512a30b8 SHA-1: 63588e91892688f78128736534dfb5ecec1253a7 SHA-256: 2c97258a7d8313d1b54fbbdcc5a5e87ba29a061d200351e20e23d195fd2eeeca
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://nepalmicrofinancesummit.org/userfiles/files/zuwovumobud.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3572c49912---falizikisagowikarobuxixev.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/7cbb9868fc2dbb6bef0c40a26728e774/94507691461.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160abe66a37fbe---konar.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dusarudos.pdf
    • https://alianzatours.com/imagenes/file/11270564977.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ecc39296---fexasamovunoxileropej.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9801bd6db5d5ba3d9a69e0e6fd1ecd5f/kojixenederiwaxisigitigad.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/botezamerizosuwunubulujo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c776d659916ba0e69e95610fea6df751/5807077818.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7123a109---fubesetenojenazum.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870371c4cb7---lodazitonadigojubumas.pdf
    • http://fouladsazanco.com/Upload/file/21632038039.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/u8n95cu557m4cmucmgvk9l69o4/nisevosuzopewetuzana.pdf
    • http://dotacjedlaoze.pl/userfiles/file/58775084586.pdf
    • http://www.awakohchang.com/image/upload/File/9706295499.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/66088791392.pdf
    • http://mdsalon.ru/img/lib/file/jupawovuvexodolezop.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ub3a3pv3pgl8h91f9dnb583cv7/gurotikigavugej.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c4d71546---42769861974.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/6839244105.pdf
    • http://conblocmanado.com/pics/file/didomizebopilebipesamusef.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4a5d9a2d22e10b081f597e0a2a8d1584/27811712663.pdf
    • http://rayanchem.com/d/files/gukuzizujebub.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8qk0fvf4k08brc86ga3ta9mkav/tisivitotuje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=classification+and+regression+trees+breiman+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16792 bytes
font_01_sfnt_off000124b3.bin
249e673b499365ee08f0f8151b01a696e394fd2622a343d75442ddfd55ce9e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 11132 bytes
font_02_sfnt_off00013e3f.bin
c3dd00e4d7ce4e3eadc859c41effa290498cfe96d291ec40a00965afa192ef03
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 19796 bytes