Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd06d5ae2bfac91d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 20:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ab49c482d2f1f64dc3a2b40a631ffff7 SHA-1: 3b30d61a0b271e8dfc5e3539c932ab606b0d3959 SHA-256: fd06d5ae2bfac91d0b56db6bf6f057afd95b14a2f9c47674284083cf2160da00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=oops+technical+interview+questions+and+answers+pdf PDF link annotation
    • https://alistairmills.com/ckfinder/userfiles/files/tonukiwudekutuziv.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/46548453590.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/zejegovavomepaxuv.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pceqbgotoe2kr42ipdjavibtvr/maboparo.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/zazob.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/nizotojopagajuxetimun.pdfIn PDF document text
    • https://hoalavender.net/upload/files/6933372996.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f453fa15756---pagovodoxakanubi.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/40827049095.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/pefifugebupowonevon.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c37bb8f4165---petepijugigot.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0b4313f2---mogub.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c3b21449---vadepozuzixigogevijudago.pdfIn PDF document text
    • https://ewt.cz/res/file/vezitopabelokafi.pdfIn PDF document text
    • https://bloc-immo.com/images/benipu.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/boropiraropalaselovofa.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160876aa510031---sebitijoram.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/10008410284.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dv225rnpbi94kd8urveus5app1/77167189690.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/90330537624.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/govem.pdfIn PDF document text
    • http://dztechfin.com/upload/file///26479198067.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246bd5ab7f---zifusefujulazixim.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/xozikivuwopiginowo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8557c2f66f---gusujuxodonukomokamu.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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 17664 bytes
SHA-256: f83ca840765a329c5a6e45340aba93dd8f78265ccd82b2b8e7985ea713153fe1
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 11140 bytes
SHA-256: d5828809306111fc2d80e5bd03da96985af6df241ed20f6290b4cf464efbb76b
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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