Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f715d961f971e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 22:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98876406796b39719d6fd7c7e0f54c9f SHA-1: 0f8a5ee88b38389ed8abba28e2778ab01fd67e00 SHA-256: 0b0f715d961f971e60761dd8c1315c839e273d9ed484bae291da65c619825784
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of multiple unknown PDF files suggests a potential for further malicious content delivery or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://grupahatak.pl/admin/_fck_files/file/54087368123.pdf In PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/27536611791.pdfIn PDF document text
    • http://dejede.com/userfiles/file/71675331117.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fad52ee2c46b00e37c6af25d76256be/libulugeveredatu.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/odlfo4072k1u769hgu9k54ejkb/zoruvobufof.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xigusiworenibudonaluxaziz.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/boxunaviza.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/ganiwukopuk.pdfIn PDF document text
    • https://negaratoto.com/contents//files/sinefufamudavesotati.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a34ab1ad145fbbf169e2c039dcdb9fda/1532211904.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f85c4324a---68469023290.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/gimunixipigozirafonokex.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f047722ab37931c6727e810b58d702ee/nojijejivonupatevuvejoto.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/lovudavebititepo.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/91037251396.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108211823039855.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/82257301847.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/wobimelenuxapasabofimako.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed67eb584---18268617385.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/32537662042.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/kivalalejarilevado.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/53054796591.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/moxitibitibajilo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12bfd24b8---gezomitifuwofafutejutuput.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dbd2e380---nixup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tonsillitis+and+ear+painPDF 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_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10348 bytes
SHA-256: ef30cc525b9b13522116aa4c3a42bc74893f65f1c02feb09efee27bcb85503dc
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 17700 bytes
SHA-256: 29d42c41e2b65f85ad0a0f5d53613e45047f15018b8d131829e1dfe60e306f30
font_02_sfnt_off00013a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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