Malicious PDF — malware analysis report

Static analysis result for SHA-256 45165accb8d5b07e…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 22:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dfd37e3c88e250d213fe5162073ef5c4 SHA-1: 39b24a23069772e52d52b72afc4ef023fbd8cd12 SHA-256: 45165accb8d5b07ec8afccb49d1ac1cb1427036d3c0075a7030f2b2b98903e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites appear to host further malicious PDFs, suggesting a multi-stage download or redirection scheme. The PDF itself does not contain executable content but serves as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/7e12ed56f6418f20b4b0a6096cc5397b/febijed.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9569d5701---ropopojujefubivaw.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2dda4283cde46dedbec1e45f28504245/lufoborazuvulefa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de37289942c0718f8faa6563e88add13/bedirakeg.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde4cd45b63---8248676435.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/16043983946.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a574f552d38---64494425328.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/92011745470.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/wigilifukitilavemejovap.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e8fbcffd---womemixapupekizizilas.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/op2rfvaa663lp14ir36latud26/xomorevelirufagivu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0f5cc94a8541b4336dd1c505211fef9b/33962143523.pdfIn PDF document text
    • http://splogservice.ru/content/file/51010982597.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8bbvjfpudrduu35110tt7ggu8q/pazifanolulowasej.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/42243395640.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xilurirawewimonokupuk.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/g44egdok2013v3os20ppim5o0q/ruliwobumedegog.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849966d91c9---ranobosasexalovitux.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b312592f5---54266831755.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/50635910932.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/08sp4qvt2udtalk8et09nb1slh/4999809819.pdfIn PDF document text
    • http://technocom.pl/editor/file/votusilevozilar.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608042489387d---mibavopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+if+you+are+throwing+up+yellow+stuffPDF 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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10928 bytes
SHA-256: 7457beeeb6e6f997e182ed5ec867bdc4a0f94b37eb0db84322b8f4f2dc3f5a59
font_01_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 17488 bytes
SHA-256: f1b2a9fbb1f3502bb679a12e0963698b924bc2e2a68184966e95ff97d419e511

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