Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8cf2135a23de39…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 17:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7859ed99386b96e54387a679048b7add SHA-1: 507f9cad7b656340129e393511b054d5ce93527c SHA-256: 7f8cf2135a23de3975c44166372f0e36601bcaf166528234290889b77d5ad39a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the primary attack pattern being a lure to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99e2d0741---fonikakobogakukenuget.pdf
    • http://moscowprice.com/content/xuploadimages/file/gamugatulefoxova.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137347f53988---31239864328.pdf
    • http://traslochimontalto.it/userfiles/files/xorukinosefidowunarilag.pdf
    • http://poliambulatorioargentina.eu/userfiles/files/vurowegirigek.pdf
    • http://music-saikung.com/ckfinder/userfiles/files/rorexipinarodovebibewa.pdf
    • https://kocarbonag.com/luutru/files/duxotak.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/18604259573.pdf
    • http://rebizplus.com/userfiles/file/wasamusedizepeloluxoj.pdf
    • https://podgoricki-klub.me/userfiles/file/jujagokokovafoloruposasa.pdf
    • http://werkkledingverkoop.nl/images/docman/files/48448330381.pdf
    • https://cordovajewelry.com/images/file/fofur.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8bv12ov9d61kes9toj81ib9um3/87344094566.pdf
    • http://microcement.ua/userfiles/file/51697806893.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/xikape.pdf
    • https://rmduncanrealty.com/userfiles/files/nulekabisimomonem.pdf
    • http://idealthailand.com/file_media/file_image/file/vesefizu.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/66387818737.pdf
    • https://bosingels.nl/ckfinder/userfiles/files/zitadel.pdf
    • http://divorce-difficile.fr/userfiles/file/loninawanunonuwosigorig.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210904125501.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1768594c38c920c5a4243ff62c74f82f/kugibaluxobujezaxafa.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff5c6a566---55456361953.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dark+souls+2+level+calculator
    • 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_off0000db1d.bin
861af46584b572fd136067088373d11998f6e1dcc207a852c9430e362028670a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 10404 bytes
font_01_sfnt_off0000f2fc.bin
45017446195dad3af1eac8f14ed5940d7c6586971565335c89b6d6e3e21df253
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 18044 bytes
font_02_sfnt_off00012216.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 16792 bytes