Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ee5c0fe25cda21…

MALICIOUS

PDF

117.2 KB Created: 2021-08-10 03:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bc382e47f74f059339f1ce7b69a3be9 SHA-1: 094daaa4a04aa127d9eb5306577ece62e156a7ff SHA-256: d3ee5c0fe25cda210f50d562b8a4efda80611be277ad1f31460f12163e1d20de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ketchas.ru/uplcv?utm_term=nier+automata+project+gestalt+report+12 PDF link annotation
    • https://eric-parnes.com/ckfinder/userfiles/files/42327500798.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/45029524456.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f63214b4b---nejixakosoxupoxifeputes.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56754d88d7---nanamezaxipadil.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/24351258995.pdfIn PDF document text
    • https://doganagolosa.it/file/51293940998.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/43655552412.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95982b6c13---82037128581.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/boxuxojoxiguwikapuxaruf.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/68700219737.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/63057502777.pdfIn PDF document text
    • http://e-sportis.com/images/upload/wexitat.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/nozukozibozaguxoxiwizo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4d18fbcea759666d75f7d4b75d0aa7ea/27089340337.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/wezuwusemevupok.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c063c5f9c0---85909581481.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/khed1q5dj9hatnchene86a9717/94999025511.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/30905583131.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/35228985030.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/nisameb.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16102b157882d9---90386342897.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/35982504723.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/buvoraboxowazuvinukimida.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/musudowupinijupoka.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 17588 bytes
SHA-256: af148f22024156f18c924c7e21ca92aef9dfc8918a61ce52a89b3bbe70afe727
font_01_sfnt_off00017585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17585 10992 bytes
SHA-256: f87c88209de127c9b9f1cf083a0da9c888bd0ebb2b62fbad1d2dfbc13bec827c
font_02_sfnt_off00018f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F24 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3
font_03_sfnt_off0001970f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1970F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001af20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF20 16192 bytes
SHA-256: e2ad764752cd4be5999c18614362e0cea8e9c563e7196d76fd0086f860ccaf5d

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