Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b36ce889a5a71e3…

MALICIOUS

PDF

89.5 KB Created: 2021-08-07 16:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b70c38e07eb09527c8730b57511c6bb0 SHA-1: aa775c7fd12ed15674a739a45ec6b3bf9f2011f5 SHA-256: 6b36ce889a5a71e3258636f079274a76f7f4ef8ef4d69bfb9ddc433bc0bfaf79
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, forming a link farm. These links likely serve as redirects to phishing or malware download sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://abwmechanicsville.com/uploads/files/67318410205.pdf In PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/22994121020.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6db23944807980e279dc0c352f581b18/3215923728.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f93c3c96b---jipipumaxusediz.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/dipofodafupufoz.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4437a56c29a85a6f492d4177899b2882/tefox.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ad04cb26---bitotamoxawesekozovi.pdfIn PDF document text
    • https://banghenails.com/upload/file/36945252947.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087389f76809---73203942430.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/87710147405.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/kurome.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ee7a1583---wunafaledaj.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/dizaxujaparegutalakudelon.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vidal5qf4kkk63sghkvpi6jeq7/kuzavogofege.pdfIn PDF document text
    • https://12shio3.com/contents//files/27134818751.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/jeborele.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4344067e1a---jokiredamunoxufivutis.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/tigeredexowetukomalarezez.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/nanuriseladazajugim.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/89489970156.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///risuwob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=driver+booster+8+pro+crackeado+2021PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 29436 bytes
SHA-256: 896e08273ed9d0aa18ce26ce88533f922a46ce23c41159b92a63e54973532546
font_01_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE7 11160 bytes
SHA-256: ca68f6150b9da42887f1c66eb3d7631655ca1bbf3493ec0482b3f0944826c1b4

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