Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc93479d2d722ab…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 02:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c3ff3f170920d5d7ced796139eda085 SHA-1: 699ca923e3bd4640591b57a36f87e91ae388ecc2 SHA-256: 5fc93479d2d722ab1d9eece485e790e8abf850cca472c35d645de5e52e42d472
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. These links form a link farm, a common technique used to obscure the final malicious destination, which is likely a phishing page or a malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://krisoc.ru/uplcv?utm_term=comfortably+numb+piano+pdf PDF link annotation
    • http://applecentervn.com/uploads/image/files/15885928190.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/410844ef5dd917656874d82f38bf16c3/23711912577.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/71133872825.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1721130c---juboredojuxafod.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pprb6kq2lmrb4volpp925h7okm/laxenuresalobesipab.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/72147202722.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/35524069716.pdfIn PDF document text
    • http://cycling-software.com/files/file/73399767409.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161203b79d5e43---55939371411.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mogusasoboteposa.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/55171058078.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/39668669262.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/xavenezarapitaru.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c89413658e5---bikewerujefozamovewutaj.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/95146063391.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/kotopaliseladex.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/falasabuga.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/60533166852.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/42616452185.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/37097663546.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86a16234f---tojekuxenekogenagak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160701dec3b528---53822790181.pdfIn PDF document text
    • http://taociren.com/upload/file/210810011014437502rje4bujmf532.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ae16ad08---27052549642.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qg97ga5vstv8hud8h43hh0lvoe/58244416544.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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 17284 bytes
SHA-256: ba84d7dd698454fe9979290a657343bbde9938afd49f47224b6ae3cd30217b87
font_02_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10744 bytes
SHA-256: 76b533b228e066c0ebb9d8cec7732ccdd961a70a447497b08dc73d4331a0b00b

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