Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bf8e0861af6926…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 09:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5940dec4474a92a06cf25c7350971810 SHA-1: f0ac23749a963b7cc0a9f4672f08beb21b156022 SHA-256: 36bf8e0861af6926f3d08e45d777fa736dfe81dd091e2bc8df2155c95b2d8d39
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms on disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=dow+futures+now
    • http://acecaalcoy.com/userfiles/file/61200586893.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4b665e14ff9c9112408fc0edb1ef8eb1/47605281365.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dae105d0f2dbde027ea80662f99759a8/24793392719.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/63393885914.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca084b70b5---32805431635.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4671e8be69---97949574125.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pofuvitusemefitan.pdf
    • http://dlmberatung.ch/userfiles/files/werolisowikirotoxenizipi.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b3b77b26b93b596c60ec4e496a6bcc29/98842569409.pdf
    • http://namjapizza.com/app/webroot/files/rogewodawetilagufaka.pdf
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/33833350457.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e1e03e29e---vobavikobepivogebiwego.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3620df02ad---wisilimonawu.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/0cf1ee670cc3030e0111d8487206f281/97206127916.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd067dfbb6---58639877734.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084c16482380---nivufirevenev.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a9759c580b2fbfe310b0f87c1b3bd828/kefagewukogafogurubax.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c016546---zudifopokemafubov.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e337ec9242---pikobivelevafawojumot.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/67638d6d784b50f5ea77b0650ba83cef/72926126205.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3d03nkugld5otln5oc681safcm/88618092416.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088afa2a7627---20079155828.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098b16deece0---silanu.pdf
    • https://avvocatoboretti.it/file/32461291764.pdf
    • http://satbietthu.com/luutru/files/gepuzog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16792 bytes
font_01_sfnt_off00010f5b.bin
36611b709789577d1d63d86b30e09916e5a1ec88c38e563e052ff88740260967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17040 bytes
font_02_sfnt_off00013c12.bin
886dd2eeeac9b45d57620db103e3a80105c86c082f83e161bc7f4bd9b18a29b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 10096 bytes

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