Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d6f83d10450ef7…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 03:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24435de6ba1c4005ff8ae20c0fee54ed SHA-1: eadfb0c6bc09adab994e628e5fb41f2309738df5 SHA-256: 43d6f83d10450ef7ac73232a0dbdd190a4fa9e9348b23842cde6bf3e91e29842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=bigo+live+diamond+hack+apk PDF link annotation
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/polepikuxa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef84d66b73---jejokarixarifawusabupug.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075797449934---95307920124.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/jivorise.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b3e122a569a3d907f925b8ea22fe6fa/92860800634.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/gepafuzejolilepuno.pdfIn PDF document text
    • http://rcot.by/pics/files/megawotonevedeb.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/4n2srp4926cv6taf09jk0c9iee/dasufinovif.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090307bb538d---zukibabaputep.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ca1180b290ceb3d8a2a0dc5a50ec23b9/movebekugusejiniwufaduku.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a24a2cbc5---99260470682.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f356ba79---vadimizofapekibogatigenip.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/xusezivavipuwasux.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/51658917129.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/64647268354.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/vajufa.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6218559d---97301783947.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdbdf81325---widivodurewovowes.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/33154616069.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e26799c3b97---sunoloxudolowijesinewaxid.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b366ede04---rifapajaboluxakorogiwolu.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/52379928315.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/11781701498.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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10804 bytes
SHA-256: 45b95b0b0085a4fb990477c5dc73446172bc7e0cc6740d070eaccc85535d701c
font_01_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 17848 bytes
SHA-256: 02fe33e07cd4ccf4658b0f1eba4b055c1b0ee03ae98f6464a956f489c42a2846
font_02_sfnt_off000140db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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