Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c055a2d1e22c51…

MALICIOUS

PDF

72.6 KB Created: 2021-07-01 11:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d31550fda3123d1eb2551265e7e45b70 SHA-1: c9652be40cdee8b72166eeef2f580e48fc78302b SHA-256: 57c055a2d1e22c51cafbc51965257cd2a89592a456a9ee10508aa9524965202f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aprilboya.com/userfiles/file/88688915514.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f848d6749b---lofesa.pdf
    • https://gazelletr.com/userfiles/files/munujimatipizetarelav.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/554b9144772ac83d1bf0c884abc6e4f6/wusigawusaz.pdf
    • http://phuwangnam.com/user_file/file/dokubomosuxudapula.pdf
    • http://0930actress.com/files/files/giromemiz.pdf
    • https://kede.org/userfiles/file/rebezom.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05156f2a7b---xinazewadesimuwulumazija.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e3c7b1b44---62598862416.pdf
    • http://purofirstli.com/userfiles/files/jowakat.pdf
    • http://iberia-ex.com/images/blog//file/18124352395.pdf
    • http://usarsenal.it/userfiles/files/82859766111.pdf
    • http://vimar.ua/userfiles/files/pepafitekodibodati.pdf
    • http://kangs78.com/clients/66216/File/tizikejoj.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711dd0cf1fc---zenodolonexafemopunogab.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982d9032466---95494783587.pdf
    • http://myshopekerala.com/userfiles/file/34346818728.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b2937bc8---rolirovivaderet.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tnh63hpkt4kuhrntehcs70723k/fuzodavovam.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oiovvvr1lak51cmgod00r55rg6/7787527175.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359809b939---24348149720.pdf
    • https://augsburger-dartliga.de/uploads/file/66000818264.pdf
    • https://fa-vietnam.com/webroot/img/files/lajupilipasabuvupasubu.pdf
    • http://knuhpharm.kr/userfiles/file/20210622211151.pdf
    • https://aashianarealty.com/file/dovizenufarowaru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2008+harley+road+king+for+sale
    • 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_off0000bbdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDC 16792 bytes
font_01_sfnt_off0000d3f3.bin
d51983ebacd46bb8363c08a4372dc619efe1e3134ee0876d6c441393003cca83
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 11092 bytes
font_02_sfnt_off0000ed99.bin
03bda64165150291c6e0564713660c6934447b80197291070c58785885b1ab65
pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 15412 bytes