Malicious PDF — malware analysis report

Static analysis result for SHA-256 9663f1378d89cd77…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 14:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b5342c35af9e7669bc39f62d030013f SHA-1: cafda5c47aeff4e034d258d724e48990a8351312 SHA-256: 9663f1378d89cd7707c3ca73fcc622f42868cfcfa5fc7a9166e87fbbfbf0e718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://allytemp.ru/uplcv?utm_term=sony+sound+bar+ht-rt3+manual PDF link annotation
    • https://autoprofi.ua/userfiles/file/34586552524.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ec850c9bed8ea2c2688576f7ab1cea0b/43677762304.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/kozuzumokelekoso.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/seboziv.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/692b2230c5d454ace64e777edcc3eb64/63720984712.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc64cc6f7b---dugegejewujesope.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7uo8ebptqnv2trr497cjfmgg85/pasome.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed1c09c03---73425713141.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8febab520---lafedutodutelenusokapidu.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/kazikifedemuger.pdfIn PDF document text
    • http://ahchala.com/img/file/46432027093.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12465559506.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a8780d8679e9e5da73b88158e057725b/8259713614.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/87667532349.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/detatenodugibo.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/wizupikumivuvokifaj.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/37540383850.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0ddd23b420740b56b70613e1063e73cd/dowanozilutanuj.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/lelojavasef.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/43487809496.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608363fbbc584---6526596067.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/gagobuwifidex.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/lcbp8d17t0ugceibufch5qfn08/gubibip.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/43022610453.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fuvikibubimelezaboj.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jemefaki.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_off0000b9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E2 17276 bytes
SHA-256: 6e306a644c172c49afc78341ff3b65a6920cfea7e856dcf8ff10f4c9bb185a94
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 10924 bytes
SHA-256: 1afd8499f8876ec72e15eeff18bc583536bc402e58f86c69ff564bb565565b5c
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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