Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc539a510f384b5…

MALICIOUS

PDF

87.6 KB Created: 2021-08-03 05:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03d0c0dd14e4bd8a8639f91103db3d8c SHA-1: 9cfcced4c453181877a24174160216520430e93e SHA-256: 0fc539a510f384b5a31361985cb249d24330dbb384d08a9eb18d174f876ebdff
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are structured as a link farm, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/55866301407.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b8f2d2262---xokujudopotinigeraluta.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tezisafirimizejavif.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8d7db2b0f91ef0675131bd710c7365b5/ganovubibatopobirare.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7cqilqi17hglgelm723cpbdhv0/17686163784.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/feee77bf7090df30d1f2cf5e59292a5f/zivatogewaluwudibel.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f8e7705---pevitusigu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9362563a34---55918488993.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/01ub0cu10r1d3ne0pkeao5nhcs/sefasevub.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/cfsq7a2ij52na8b02ns3ge9eg7/nujedepenipilokawororukub.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/42846e78befb6e7d50923bcdea70e62b/tejororukutamekagije.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/modakebaboputofefuveronif.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/aa958e6ecdaeca7a9f168b3ff8b914d2/kumeza.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48351956901.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/61096270237.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/dadazepidog.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9364089b---dupavajemopama.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/69334539727.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/11290450122.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dojodaxexuxetoji.pdfIn PDF document text
    • http://abpaluso.com/upload/file/diremovif.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6797b742---47296629344.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/bunadulobubujowunam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gander+mountain+gunsmith+servicesPDF 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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 17564 bytes
SHA-256: 12c4c5db00b3054bd5dce7b22179196a1b97320db50760b60ddb86ae2a4b1eb7
font_02_sfnt_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 10976 bytes
SHA-256: ec5a6461ad2b3fa20d1bb69729ed640a0433c6a8e00ee7a6882a55e9817982a2

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