Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c75b95df294e33d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 02:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d20cdccea1b99f3e72d571f8d8f2d68c SHA-1: 581cbdb1aba2c4771ed2d443e278732256c29571 SHA-256: 9c75b95df294e33de8c06b584b0549d4d05b713827928c2a0bd995b1d4886b54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=geometry+rotations+worksheet PDF link annotation
    • http://seksdagen.nl/userfiles/file/lixisos.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/kosunawi.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/nutisegemuwuxutosoboko.pdfIn PDF document text
    • http://www.moyekolodin.com/files/61912766780.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/turuki.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/16274228082.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c51cc5a34---fuvufurutewonerur.pdfIn PDF document text
    • http://puisan.ru/uploads/file/12495488057.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/92552642714.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/86195669279.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/4597043454.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/nakikegibunusijaje.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/wiwilutibisofipugawi.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/dobakofuza.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/81959612657.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394960590ff---karakojijol.pdfIn PDF document text
    • http://24cvety.ru/upload/files/sizirexemuvuk.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613190377b96e---89238766027.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/86601463026.pdfIn PDF document text
    • http://infosierra.es/images/editor/fevijodivanoxitomu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/j1q2lmhh2sf01n4igb75gv9jvr/42040607241.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161465e5770e4b---2106083015.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lobosidekekute.pdfIn PDF document text
    • https://bdata.vn/upload/files/xupedilozegakadusiwugosoz.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/pamafomufamewivode.pdfIn 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://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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10660 bytes
SHA-256: 32b2b143ac525ebce5869e6aa9a35e6dc8d880a945a24a368af06112335d21fe
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 19008 bytes
SHA-256: 2cdb33962824ec59a81faa06594bffd7089ce41d95dcff23701aa58fae3462a8

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