Malicious PDF — malware analysis report

Static analysis result for SHA-256 429b1bf7c10ba794…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 15:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0114c1283750b8451bcd54aadb3a191e SHA-1: a2bb9a1551d5371b130c88ba11c2b82f21ec9dde SHA-256: 429b1bf7c10ba794fa898d56a597b0ddc29b16edd9fdcf7b1fc4cb17d756bc3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=the+oxford+guide+to+practical+lexicography PDF link annotation
    • http://associatedreclaimed.com/userfiles/files/80035014578.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/nudakalosuvorisefimepi.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/89818932741.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/dodakumedawuwodojujafudo.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/sozatusilegobilo.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/tojinexipipulorip.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zolukigeko.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/54818096262.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/67d5946ba3f68bf915137022276559f4/24633271086.pdfIn PDF document text
    • http://ropesadventure.com/d/files/ruxos.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7db49c4e2e33768575b155f61a9bb169/68850841180.pdfIn PDF document text
    • http://skncn.com/u/files/48173367796.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/navekivijogobavawufawo.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2p7ll1i5fq23viiddm520t1n91/pakifevejanulesosuwi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/79919398013.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/85298866615.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118660237d17---xokibubatitufuwi.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/21021778645.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/46541624576.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d49986241ea1cc77bd7829dd742347f2/12181819562.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b775ae49d38---bikukakewokaruweti.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/jedoxodobuxe.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/sirowofunad.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xidegivuridevo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 10904 bytes
SHA-256: 3e1ceb878b6b3af1d73dd9b5dea58f27fb223a57195c7db521b561503c767c44
font_02_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 22952 bytes
SHA-256: d9b119c17367bc72ac249a18937c60c133da663b2410fe431e7b29d2d878a6bc
font_03_sfnt_off00014db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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