Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fe61a342d5bae0…

MALICIOUS

PDF

95.7 KB Created: 2021-06-10 04:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73a2e7c2df73aa81041c46beb5377875 SHA-1: 42d9423bc6b4d6e10552453cfa145822fc1ccb2b SHA-256: 27fe61a342d5bae0adb3797c053abb6ee3bd1945a6e7ee212f701e3816631ccf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which appear to be part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=aaj+mere+yaar+ki+dj+song
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3dab2e4d---31099764361.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d150eb81f---42736574230.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a4cdac73---wotimujibetupapizu.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fa505e09---sigunagewejobos.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/32690798621.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27671683940.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bcaae0ec001a4d9a53158eeb26b2e971/22671220626.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40cf54b2b0---6068021465.pdf
    • https://peilimineko.com/userfiles/file/25119006214.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608771244ab4f---4894792731.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c0db0d6abe3d59369f484bc15576dbfc/dalip.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdecf70f5b2---zolafijefolabe.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7dd730d7f1acad0ea806e4fd1f2a2e9f/lekigedupasuluwegaponat.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/65034139190.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084620319312---89796302077.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ed6d9c45ee29113a758a8d2410c3a0e2/nupexidebifije.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f947c00b5ea67463ab1e877b8e3eae9c/ravovesovovilakadusufuxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e741.bin
099b7a3202a5eee68ce473b1d0c3cf2438d30221bed544c7f0f749fa4f72df18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10000 bytes
font_01_sfnt_off000108fe.bin
f40d5b65bea3a0a7ac89812dbeb3990c659c0ecc2bd50ac9c6a9de15f4c781f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 5052 bytes
font_02_sfnt_off00011a16.bin
85959640c08d7bcb1701dba1fba07c5d73379a255d027c90b5ced51d5eeea2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 2628 bytes
font_03_sfnt_off0001253d.bin
4ea32ba9611c92559e28fa8efcec47c9cc03d1326aae22457e6036616883416c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 11932 bytes
font_04_sfnt_off00014d63.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D63 16164 bytes
font_05_sfnt_off0001625f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1625F 4324 bytes

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