Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e85efbedfa7d759…

MALICIOUS

PDF

78.7 KB Created: 2021-08-11 09:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 395a1b196fd4b3e45e9dc3b2eb15df73 SHA-1: 3ace9a9d3562b940f3d6b59d2e9a86003c90cdb6 SHA-256: 8e85efbedfa7d759beced264d7a61b532b9b533838494deed66b561151cb6f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6610c4bd6---jukixelokarom.pdf In PDF document text
    • http://faw-asia.com/image/upload/files/waluxobezax.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d6f51f0090c010cccb76a1655dcbd247/jotemedi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/zuderefara.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe912f8f938a2972c30378e7b66670c7/bodewutesumebedetonafub.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kebadipaketameseje.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b660849162d---wozabidegujisepufiwezukaz.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/29065388580.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1bf4f09ccced1ab0f3ddeaa71331690f/59879142722.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/nobidupojubebev.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/41835047964.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1cc744d66647adc63fbd2de9178c62f4/90413293460.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f2292520---lazog.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/12904188152.pdfIn PDF document text
    • https://noddy.nu/images/file/fobasomeborimom.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/13027577180.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/73475083634.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ae61a4c4f71bdf8184b8e99880f43004/27654263644.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/33677445137.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j1e9njij5abfvh95spg240d02h/11465079539.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0e9e385c0e6925f6c701a313fe14e156/64352145351.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/23514285164.pdfIn PDF document text
    • https://x-software.cz/data/file/pirepesasevarobitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fundamentals+of+abnormal+psychology+9th+edition+cheggPDF link annotation
    • 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://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_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_02_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 11564 bytes
SHA-256: a17d072c80d0e6ecffff73ddb81f2b287af0f359e128918b8ca5813326f2d052
font_03_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 15912 bytes
SHA-256: f7c2c580b2dc223f30a3279c5fd136a5add11872a716162f903b8cea13c9f97e

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