Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f0f4b72b274a04…

MALICIOUS

PDF

108.4 KB Created: 2021-06-26 09:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55933af40995c887d5dc7bb5621b35f1 SHA-1: 02203031d02ad4950e254b30a3b49995d7db8a96 SHA-256: 28f0f4b72b274a0410b2d85ed84238f0dd87e25055ab1e5c3f92e8988dd70c69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple websites, with several URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/51113741153.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/961stmu9iabonneoph603cs7ug/lobowesejeg.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f991d5c004---22616182181.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c919f4446f1---fegosupaxe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a24r8c5bo54408ifhrd8nhnv8m/45877575296.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaf4550144---79784206251.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160768b25617ee---sodejagubifuvowod.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191410.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/aece3acc52a8cb521bc0ae0a875b6cca/foxakekezirikozepepotu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9e6cd498c031bb7f5fdb17f8df661071/badawirufafujoxovadosu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093392f742e2---85654347380.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/85621867560.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/jegufewi.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zegazijifuxisoweniguxibi.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f2d4c731---piveparomawekofiramufag.pdfIn PDF document text
    • https://bloomeng.com/uploads/lasomejumeburapaxawur.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/85545181918.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79f51937---xataviridilit.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d509e39d92ea762a5e0d421ef34921d7/gazuf.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fe7a4e4271497c9d2609345808f2daf5/2612365317.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/pelexesarinexadizakuzini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=missionary+style+photosPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 8312 bytes
SHA-256: a4e13f692681ffecc31e6ede0f88d79c7c4844891679dc2f4f02a61dd38a402d
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 33188 bytes
SHA-256: 081a8681632f0a2efdd2067023198677a3e2e64ded9fb735d3ac6bac56832bd3
font_02_sfnt_off0001498d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000161a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A4 10456 bytes
SHA-256: 32f7ad3033a1d935c328158bb3da7af5f11db5d9858a20bf08b11ed1853b51eb
font_04_sfnt_off00017954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17954 23044 bytes
SHA-256: 2cbf27b0f7dc96d8406621c0ce8959335b0e033d68bef5bd8a5c6f3fdd66415e

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