Malicious PDF — malware analysis report

Static analysis result for SHA-256 73445a1523c56e22…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 18:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32048e05fd3b5c978aed093675a6f32f SHA-1: 8dd23990e9134c48775b8c4744b710361e45c2fc SHA-256: 73445a1523c56e22bd9bc5afd1b5b4b4985ceb6e805ae11edcfd9f50bf52d129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=2012+chevrolet+equinox+lt+manual PDF link annotation
    • http://bongoes62.dk/userfiles/file/14481328876.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/3383290495.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/varenuxeniwi.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/lamogiseziwitup.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b96d3cfc7---mebibutolilinif.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/52043213284.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/o3evt8bpjlnm17hh5qfplblfqv/54740622139.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de97fd48b0---71949289703.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210830094418.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd002e3c42---tuxolorolada.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/806f617732e0bfab9a3f78a64aeea354/20413861380.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1c82o4irsd11on4rs9piaefgap/saloxufixirugejajedil.pdfIn PDF document text
    • http://ge-mak.com/files/rizefaxibupizuxatajofake.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/dikidilu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/82053411325.pdfIn PDF document text
    • http://vitrine-prof.com/files/83191706451.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/39515240965.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xuxegetebirogeziji.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a76aee8b40a---37308382191.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/xisebuluwoko.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2e8f8a571331e3643cf203436e610e95/19633644105.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pib752el5c98o97trs8ksh6q39/93955005095.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7024678---18061233947.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1d6523b9---nofizuros.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/66528478053.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/zujezirurofepexus.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_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 16812 bytes
SHA-256: 9dc61eb6be39c61756948e5d5183a5f893051acf044c139c00f99ee5acb0c4a4
font_02_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10940 bytes
SHA-256: 5df604e7ac40617eb8ea3c10da49b7b741aafa83be98819be98d185fdad97893

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