Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92e988d3e52ac08…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 02:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c109c3bfa9a090e6b64edf741d33fed SHA-1: 79dd0edbf33d79e2b9d2a68bc7124dd640d1fc23 SHA-256: f92e988d3e52ac0899db88d8664dc32e585e3a35c6fbfa1740ef6e2eb7f933b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or redirection campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/v495qvn2c4c5vf60b0kftun186/77111883771.pdf In PDF document text
    • https://ahha.az/userfiles/file/fubanolodulux.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62bbd1c1a---wuduziworukuwe.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/dexijovejujojek.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a56c3b8a7---88800038382.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f13ba2510905bcdfe1e90feb2c7bf233/gipemurawesurenupesaj.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/652e932e254cf5d6e264c493ecf01a56/9190695320.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/sagulezi.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/80226244484.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/o0u3m58ka2qu657bhppn9llcdc/12898854442.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/70868575679.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/928ec3d0c53e0a5d70824dde8b7c04f7/44020833945.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/94028654393.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8660e061---magamirebulepixibojes.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/9122480532.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/86390191036.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/sonelutikuwowewikekisax.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/23e9fecc25b202cf9fdcc48dd7b5de18/silegifetitizojakibekagej.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5564da075b---42408475864.pdfIn PDF document text
    • https://advik.net/userfiles/file/90583577334.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/35171781230.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/19573614581.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/eknrepi6qoe2i061tu0gtuipoe/92760809745.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae70728a5b---55143858376.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/pukawuz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xirizugemubored.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=storytelling+cards+pdfPDF 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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 17796 bytes
SHA-256: ccb762becfb45810b3427317742d60a17c5b737468ebf33e0f36a2174ac18959
font_02_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 10984 bytes
SHA-256: 6326a80d357868542ffaf0fa6f8e1dea3ffd5666ab03460b356449824eec8bd3

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