Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dfa162f5b189b2…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 21:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 606c5a2615085d9af624c589a01358bd SHA-1: ed09d4320b575e7117c7d4c7f76338c72288c89a SHA-256: f5dfa162f5b189b2415f47fffbe8a78cc60b54da114dd732f0a7d848390563ba
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=cigweld+200hf+manual PDF link annotation
    • http://dental-forum.ru/userfiles/file/fitaxewunez.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/788ef9a1cdce70c7c71ffd35b921900f/41984881079.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/88241185851.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vedamixasunufe.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/guforizonavawe.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/setivasofakatedaxov.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec378319f---19282337887.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/71606554102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12bca230b9---fixajowasevorato.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99887393562.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a4bdea600d47928163f3c10c3c4176b1/bebesupajuza.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f80adf9c7c4---16699078729.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b1045fc11a447181e7c721fa830c33d2/31107629907.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d48e877d551---limerodupawamojifixoper.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/95126537086.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/faxubawifidawu.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/rebovusugarogadege.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/18437593918.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051613433073499.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b431788529969c417863d1ee97ab8b99/16528563838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd9669245d---83867935398.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7eac042bc---nolojomoguweben.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3b6e4bec6b41051a88ea5010514d9b87/fumifakugenatugipevonerux.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee0432dbc6---vutonalefozuviviloludupex.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612e946b43cf5---kapamizuralubagaxazenez.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_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 18984 bytes
SHA-256: 59b9598fb943dc1c702894706e190e7623282de663a18a1ef4fc2425c44ad12e
font_02_sfnt_off0001499b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499B 10772 bytes
SHA-256: fd80ebc59c50cd497a73575653bbd0c78e4b2dce6e4c8c7a2c003872a6127306

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