Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa079be864fbb66…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 16:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ce82b2610b2e5f9165495a52441ad19 SHA-1: 949349e47ac3b7559094bdf50c045a8a3fb89df1 SHA-256: 5fa079be864fbb666854ea5aa53f4e61b902d4de29d69aaaffbd8d548bb324a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading a secondary payload. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=lowara+smart+pump+manual PDF link annotation
    • https://betentour.com/sites/default/files/file/kazofewavomosa.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b76d92d635eb60d5fbf5765d56dc3181/labisutemapisuzasiwap.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072783b1af0b---pavirisusanerivebafovaj.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097631f186ef---kikunamisu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5b88efa2---49718569090.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/kojobemabisivizeg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf90710e6---70018051069.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9sjs4s3vvalr3v1dcvcppl3c5j/mezut.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e223b66b9cd---linofuwubefetavozo.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sinekoxisebi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5jsfv7c786km4v6sesufqaua93/tuzanowuwufiwekoja.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dijibimijolaluxuwobuda.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4fa9916b3---tepuwakukasexi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9aadbce2c---sedogaxevivinadiwe.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/62569808023.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/c0hfsfu1j9rp71ekggnv5t843n/3805334185.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6ec09176---12594470801.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/bedokanejeravivoxis.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/12064914843.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/eed0c6bf4ec5531d2bb8da044b90a7f5/51745035299.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/82344429435.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021081523483957.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/lolupovijozog.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_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 10332 bytes
SHA-256: 0e7a427e680355f49e523fce495b1d041de44612c05628b14f939ce622861e25
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 17408 bytes
SHA-256: 4e20364bdfe78447dec499adee623732de20a201199f102a689668c2516269bf

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