Malicious PDF — malware analysis report

Static analysis result for SHA-256 10143f10ad44111a…

MALICIOUS

PDF

101.0 KB Created: 2021-08-13 07:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dbc58a3802c05ac592df80b57ffb14cb SHA-1: cbd53afc85976fbef0772465b5b223fe233333cd SHA-256: 10143f10ad44111a781fb95fb50974ce56b6be3fea3b0f33bd1958dba111b6b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute further malicious content. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=tekken+blood+vengeance+download+in+hindi PDF link annotation
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85a8b5fe2---97466848743.pdfIn PDF document text
    • http://lukinserv.hu/file/61278089292.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/82478010982.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087734713c9f---gufodofedefaxikutudise.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/polojosadubik.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jelabageman.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096893d91e21---woredakufasakexo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/11698378805a7b46eadb4be993eef400/nipokubobukog.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/89425a4ca234c2bc0b8c982eab8ac984/75613211809.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/lekiniluli.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b6ff2dfa---44964073750.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/51325484543.pdfIn PDF document text
    • http://htwy.com/upload/file/44594482948.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/87987759722.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929de65f95c---jewiditid.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1fb39f03a---51169016365.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/kowobu.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B26B00367D8.pdfIn PDF document text
    • http://standdominica.org/files/files/gapaj.pdfIn PDF document text
    • http://daydala.com/userfiles/file/43817867721.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/88868479673.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/99895143197.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ocef1rufso3cc1u9itnm76lg8r/nafikagukos.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0ec466ac1a170804902ceb84df5410b9/livifiwotuwilifev.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160762a1dd044c---16992739314.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
stream_006_off00014f83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F83 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 28952 bytes
SHA-256: 3ac69d0bb82e9e9275fc826afa694d4c7560ce9f936a214e65633a8ed38032f4
font_04_sfnt_off00016b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B84 10628 bytes
SHA-256: 8c36d0764a4b809fd3a7f0ba2b698874308368c712f03fba22a6f27abb5334c4

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