Malicious PDF — malware analysis report

Static analysis result for SHA-256 935024ed7e126448…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 06:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69f2755584e1fad7fdff01e8e9dd1ee7 SHA-1: 33e11c72c9df8a7ab82ec83e1c7962fb6495ef15 SHA-256: 935024ed7e1264486a3cf96369c3ffd6031a1b473be545a3896a1cad13a083f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were directly extracted, the overall structure and URL findings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ketchas.ru/uplcv?utm_term=shuaa+digest+april+2020 PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092784f701c0---12441234560.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/bevulazogagi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3ab1ad353ade96d3dee8a84af4c2c19/riwudoniboj.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/muxudesikad.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcab158685---17186370388.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dfd989e6f7919190583aa06a2ed6f6d8/39206363026.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/naponovuwoxiladirowozego.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8a2cd33bd6dc741190525926f2eca929/86920530881.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/36911691101.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd33e88e830---nigowerewafofulaxe.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/60076436656.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/zesekosaxojisusi.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/503e9eea04bf64107b7cfea18a3cb8cf/kigipezizo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcd4ab267---29275026680.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/dopitexajevojuloxisis.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/37605800098.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5995f062e4e2838bd5cfac94ec4fcf1f/lubupizutuwubolijupa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ab06639e---ziwas.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a1fb8d360d522e40c7e7e5483a7e994c/koguzanigifodorep.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/ripezujo.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021726844502052.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/40b96823d09aca8d1a8c109735cac2c2/lezatuzevopu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85523b0d1---foruwofosoritan.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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 24424 bytes
SHA-256: 10e9945a12a777c3ff5b12643ff225f1f950ffefb542477af1d1f2ec1550b19a
font_01_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 10864 bytes
SHA-256: 6c044b4db4a5b833172c73503b3ac782fbf51510ae2f099cfa96da014ab7887b

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