Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca363aa03953608…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 11:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e170b8eb7a40e03d4ab1c7c6f439f01 SHA-1: 46d2ace74ceb9b2457413818630ea916fe2d9708 SHA-256: 3ca363aa03953608d14b3e566163a6ba0669c0893914c2f10c29764d3345b08a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://turismopontevedra.com/ckfinder/userfiles/files/gomasunuvu.pdf
    • http://xboxheerlen.nl/userfiles/file/13020467394.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0a0b9de7---6255084453.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160837db243798---28113803217.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b769447c2---kopopawanibatabikarotode.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jb3vfb8g9djgbjt05lvst3cp0l/68171576636.pdf
    • http://envisystem.com/upload/userfile/files/wifabalal.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sisulitepevemamamo.pdf
    • http://el-master.ru/userfiles/file/38948278328.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d35ac402b18aac849f5d770e9b3ffafc/1185046918.pdf
    • http://pelesiuvalymas.lt/i/File/8361035510.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451f451c3c---58699536501.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41175cc6a---gizuvojaw.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d534c36d---20324846758.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebeb44483f---kikigaduxigero.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f29bf8c51ab42dbb637d4361e8d24e4a/tobeganubevugituwu.pdf
    • http://biosite.ru/images/news/file/83227194954.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e055fb48ba---17926806396.pdf
    • https://presstone.hu/userfiles/file/95151650636.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/s6k4nomdj7dhjrch3eu6srpd30/4172278839.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0220a06ba3cd6233bd0667e7b4fec4d1/mifiwoxufimawos.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/35u555vbffh9qn7gqmi2icj8tf/98179996546.pdf
    • http://wojno-stal.pl/pliki/file/davul.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160982c437cc74---87571335142.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+happy+new+year+2021+wishes
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ccc2e66fee6f3f1544c09682bdef4a3b/fazamiromekaw.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_off0000f2fc.bin
a9c9fb682bf3965d714bb2d4b9ae3baa1d62b2c994661cf54d0ad98920edf956
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10884 bytes
font_01_sfnt_off00010c31.bin
1314c880d350ac06c604214af66e9bb70a118e2bba258a286bbd611b6d5410a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 17044 bytes
font_02_sfnt_off0001382f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 16792 bytes