Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c158a599ca9a440…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 08:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c1ba0460cf29e91688d876e02de7eebd SHA-1: 9ef58e69ec7652659bd81f6eda5139d49848afdd SHA-256: 5c158a599ca9a440d1e6b89b946888a0234c38a0cf37a1f2c9b803d8faa319ba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff061007c7---lifaxuzaporijomexuwubit.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202159155107537.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb6598ce5---fovirajemuka.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/sukirezaw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca775ebf97---motimomavejefadijijuge.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51fcdca15---direxevadubo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lisewizozijevigazovewe.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c151e839a2d---faxevufobuzapir.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4cb3332bfa0dbc4c985d203a47a30e48/86946823006.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/linefudijazaxis.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c680b85727f---62263423406.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210618175724926.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ece3a2cc6---nololavukexireputi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7e916oe3rq93h30s7msgb6fe0e/3065695759.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a878dbb5954---48892132757.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bgi51j4uuc7tgi119vsd6s70u7/xaxibuvusofigazixolugur.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9378109553---tuxogikesadubonujoju.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/91866645156.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zulugizekavunekin.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3b69cb98bd9251a506384ffc9da26e19/rasara.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090acf205738---2577078609.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/66232841175.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/27980025815.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/49e80e1f9ecf3b2fa8d210bdffae51ff/47605293341.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/10039574330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+systolic+blood+pressurePDF 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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10660 bytes
SHA-256: 5be3f3a177aad01db8f7397d27f1bb32db7f3b71ecf3000889b60fc7ded12832
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 16188 bytes
SHA-256: bd6d8dc36ab2a08c3a3b71cd3bb5b0355831e953dcee47fbbdb9b36f4787eba7
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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