Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beba1b81c8e2d67…

MALICIOUS

PDF

79.5 KB Created: 2021-06-14 17:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5138ccf5d4efda838d5aed588d68dd90 SHA-1: 8e1b0606d013dd933a424b929455cc9def10b2a9 SHA-256: 8beba1b81c8e2d673b553affd091307a71d4f161a1f22e863409011a2ddd6bb1
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as media files. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=kaththi+movie+mp3+song PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e2d4343fd23e3744fbb67c80f01b8e30/54714110843.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb60b0ad19---tepetudebarudalexi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/in4ucr38h5epas7j4c1us3stpk/23410286973.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/doremofovev.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e14936352---66672959255.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vetonox.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/39lsacedc2njrvqarmdpop3n2h/46467859065.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079723911ada---widideruzixejopuso.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/98760584907.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0884bb605c9d5a73d8f3b9e8ee5f6f18/91715791892.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/65072143950.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3604288bb15d7c0a460af3cf3e3f1ccf/12285542286.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/nowukisut.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/werotixek.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c75f3ea48---67181043314.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1fqu03urunaa1740ror99h22rc/wedolasol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 5300 bytes
SHA-256: 7b47fa3aa54b830db4e13f724c193e82106f887dfa35ee7ba9e74446fbb102a7
font_01_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 5064 bytes
SHA-256: 1571fd4e476ed453d77b82d28d703f602a4222f87ef9d7cc28b1bac6dfab5f48
font_02_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 11568 bytes
SHA-256: dfa6b623e2793786b643db88499bcee560bd63e6be3e7ccfbb740f2f5eb55cda
font_03_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16200 bytes
SHA-256: e75b3c9a5365b60e3432d8485d4f3606d6697b2c1065958a898d2269354b11c8

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