Malicious PDF — malware analysis report

Static analysis result for SHA-256 f434d09fb7a10c11…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 22:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 470c95a32d96fb8ce4f5427fba6bfc9d SHA-1: f6978faab5e0c3a59760896896c6b4c4c4165589 SHA-256: f434d09fb7a10c11ea53b8bc273f0ca28d5d132638083d314ea364a518854205
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a phishing lure, presenting itself as an image to obscure a clickable link. The link directs users to a malicious PDF hosted on a compromised WordPress site, likely to facilitate further exploitation or credential theft. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=3+storey+building+plan+pdf PDF link annotation
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/95349563891.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00adb21421---soloxeja.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/bedasopen.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5b14aa96d038383b34f3a6c87247ab03/finavatutovikanasi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/dabiseleweruxodagokudidoz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607960f632e5d---fuwoloz.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210703074144.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/82964110078.pdfIn PDF document text
    • http://labotinnghia.com/img/files/pivemebagagevepir.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/27hfggn9a8jl3tk0a3p9v0np1u/65665730075.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d9fe098f07a212c8fe510964faf859a8/16949688718.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/23cujhr727qkandf2etdcidg34/vulovewi.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lojovapupegalawe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a85be33f2---lidebivibemekoj.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8fadd8492---perem.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979884117c---zopovabuleromimunum.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e11guue84v494jacrrko2o9qa6/noroletumu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/52666273944.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f9f9264d945f9d8b21e7de8fbc701afd/pugulej.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210808_D66C41E8CCB8DC40.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbcfd25ef6---77554712101.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/latazelure.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/18471565016.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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 11100 bytes
SHA-256: f90a001a2fabd9aa662df3ee5a21f905667bf9469af9fce756ee5257b54b9d7f
font_02_sfnt_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 13920 bytes
SHA-256: b09e5068a18c7cb736f6108616aa589b81e14b3d120ad8e5c6c4107f92292cbf

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