Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfc36a91037d0d2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 13:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cbd05bbab2ce6c936a881d12dfb0254 SHA-1: a0378e5ace4fcc81b1b86e48da1c8e51e9a62c17 SHA-256: 2dfc36a91037d0d2638f13306092b18dfc6fb2c1d3d408e4f261cd1966bc2502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'Phishing.Trojan' detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://ambvetesopo.eu/userfiles/files/70530823565.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ce2dc84dd3344ad138cb121e2f27a29e/wudenadu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/8748009746.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/64162387472289e29fc94b7384fff0d7/73461912993.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa8b883d1---kowonusamok.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/bixugowuxetaxunev.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d60dce4d7---67874359792.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70d83ec5a6---vewudixuzosudebasufo.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/tiwefobatiworiwovudupodaf.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/42296347999.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1c7b1af1---fetamakekulew.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/92fd0b382f1efa2cbf6993abefd06be0/96526620547.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/63706989148.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/zazakiwom.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/66437034909.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/74353275197.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/zagidopupowatasin.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vejufabokowunuge.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nogadotomidebodaji.pdfIn PDF document text
    • http://unsersohn.com/images/file/zusajof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=right+hand+rule+practice+worksheetPDF link annotation
    • 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_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 16760 bytes
SHA-256: e196e019e44258c663cbb15818e24d471d4d7a7071be72fcb8d820c27d81d5ac
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 11116 bytes
SHA-256: 553a2840138150a3c80a0ed1f7c0390c362cc59fa0bb60599e01fcc2321933e1

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