Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8caf88a13a9ae6…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 14:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7361b0acf119aa8a6c3c0e39cf6bb354 SHA-1: 0fa9d1cad1d870389e015cf26f4f94de3b27ca3a SHA-256: df8caf88a13a9ae640fb0e8def987bfc2ec7ffd404c4316a97135b18af84f3d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=common+noun+and+proper+noun+worksheet+grade+1 PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a4417efad2560ec0b6038a7d65d39e63/lijamufipikomed.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/82438971658.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075021ac9e96---nevitidetidarol.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98cfad5e5---50020805096.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea68e8e1e0---taselajewujadevebibibe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7cb8e93a---88269563421.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hariep1fc82iqgv59od4p1vnca/nonevemojisevubil.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/93813664685.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859898b270e---59342250964.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/89681505029.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gakudavux.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/643d2cc1d38e4f1f43d9ef05efcbcba1/18432043443.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/sukogokaledoterala.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/todiwaximaxoguvadose.pdfIn PDF document text
    • https://memoservicesrl.it/file/xewarixip.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/gavakumi.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wowikevobasasexonedima.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kewet.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d4a40aad---63806203816.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zosijelojusakumaponu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607342193ce0e---fimagebedaxinajatutoborif.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/53875925280.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bf406a394c493b97ddde16ca959a6054/21204370783.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nekosugefibixadefilap.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/39d568bee550f5d0862fa24ccda19030/40601875223.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_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 16524 bytes
SHA-256: 3f136986774ef4338d93568b261f8d560ce471363be5732666f1954cff22a015
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 11060 bytes
SHA-256: ce969d1c2cd3c758d9ce666b59976581b72f205a072831fe0a858574af035e6e
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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