Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cea5046e1b669b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 09:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2de3ef85d2fd008532c607faa34ffbe SHA-1: 1701ffc05b8f0509398335034df0b749af5ff719 SHA-256: 71cea5046e1b669b6f379a9cdf403614870e94cd4e3778c635d18cf106de77b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0db9048a---luniro.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/56823765431.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/15f8ce34eaebea7a6b6b2d8b3893b4de/pokobevopokopur.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/52238125175.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0036f3ad4---42383039907.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5da0f298d298c5445d34db96a8f920ad/sijalew.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ededa190---vojelik.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mqrk6jg6g69fsju3benva1c350/67417368873.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/fd568384ocfue5dduvcckd1pj5/93800469196.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/852cafae519d789e0131ef5c74ac0c21/tukebeninekekone.pdf
    • http://congtyvima.com/images/Download/89527512824.pdf
    • http://al-bandak.com/userfiles/file/85758359956.pdf
    • http://feach.ie/images/uploads/file/67685544523.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607364e000570---34206141144.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c086e065ecd---4264741672.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/88777058185.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5qo2aauvi10p22gmvu5o7m0i60/261972703.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/df53f5fe8e4a0a704b4d82d71c841135/xivowoganajawukade.pdf
    • http://analogsys.com/uploaded/file/1201328404608c8939ecd2f.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eivk2phhumv0i9ij5honri8c10/diwusedarejuxefibit.pdf
    • http://lawngo.net/fckfiles/vebeziwajup.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96e98216c---vewukofesaxuvigaka.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ed8c3bec---88600589799.pdf
    • https://loctra.net/userfiles/file/77773327560.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/97506011670.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+mp3+all+of+me+cover
    • 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_off0000f3fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
font_01_sfnt_off00010c0e.bin
0945c4477b5f204f4b72caf42f9dce3f73268b255321ad5c83708fa735285bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 17204 bytes
font_02_sfnt_off000138fe.bin
2a121e1141e0b4d05ebcb4253c031047d8d8dadb0acce086de370612c539b60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 10748 bytes