Malicious PDF — malware analysis report

Static analysis result for SHA-256 670db8138203986d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 01:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c429ab0b678602c7d532b93982e7e83a SHA-1: c1ae434669ec34ea5556b77417d0d8e088b24f3f SHA-256: 670db8138203986d42134ba069fba4381a13a21385bd1b23ad7e1c135dadadb5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only lure designed to trick users into clicking embedded links, which are numerous and point to various external websites. The document's structure and the presence of multiple external links suggest it is part of a phishing campaign or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=criminalization+of+politics+pdf PDF link annotation
    • https://strechybenesov.cz/content/94473432812.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/ketaxoribizodokamev.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pipugotilanokotofajopivip.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/734bd248b5e199c300455e48446b7442/vuvaf.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/9043715028.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d26f2303514488cae423c5bbca452758/74046985636.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/32cade3917e759bb87efb3399029c966/64469546557.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/74092602368.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/177bdcdc8323568b2a6b30bdcb0082df/kasenumiburuzexezedin.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/je1ubi8e69p6aa1t691opee37n/74993868372.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161010a6b11292---jusenafazaxerin.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c712d9d3---loxupuroxaninutigudika.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/d0029fe4c457c783ab87dfe1e6a2d279/ropulazarijariwu.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/67145574338.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/roxodufamib.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609823e97ee57---jusuzuwewuruguzuxoxepebo.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/96636390727.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/jamurotarus.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a94880dc5dc---lutukewasan.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00a686d49---jupuwuzidojatisileku.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fubp6i1kllj2qg13gf25ql2kk7/xamukabepifokofutolonotu.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/26498749736.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b57ce2bf---xiguge.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/wotesase.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebd3e043e---18907533759.pdfIn PDF document text
    • 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_off0000b6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F0 10740 bytes
SHA-256: 7d8596500afe9983e68ac6455672cd4e64757483af003ee4fa112f0b76419b81
font_01_sfnt_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 13832 bytes
SHA-256: a0d7dd4d3c956482938df3a304e2fbab69ab8d1a1d7cc42fdee0b2c43efb3bc0
font_02_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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