Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b395353a4c7ba89…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 01:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99fa7355bbc28a2f5ca8e7a0fc6c8f14 SHA-1: 0405459518216425c3dab4f923a869fcf4d19166 SHA-256: 0b395353a4c7ba890f027df70ad2902f208600336ed239e942097a8aa6f5d403
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://barahi.com/assets/userfiles/files/49043823494.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/dekigudewu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059dcb95d---wiwemenaz.pdfIn PDF document text
    • http://usagimatur.com/files/others/fetemeludajezemudibog.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/jisegorinu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/45784099396.pdfIn PDF document text
    • http://lagrupacio.cat/file/32350502817.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/ritupetajifofa.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kidefavidelomikibebivil.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bojosap.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/jupefudilavaroxone.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/35375081310.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/zipobejogegexanerowez.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pipodirepu.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/verelaxonepuxawide.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vekinelu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b47ad1d8---45493951643.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/84267133464.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_06A04D55F7B37768.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/64320192536.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/19123168252.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/bizogofategovirilinuf.pdfIn PDF document text
    • https://digiconelectronics.com/media/45062885342.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa9cbe4a9---57417865189.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/panuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=poziomica+na+androidaPDF link annotation
    • 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10148 bytes
SHA-256: 9b1d416713b6211ea173c2cd2e0af3d84fe890393ed35235fe1c1c1ee4d9e3d3
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 17924 bytes
SHA-256: 03df92bcffc2cf8f50b32b079082753d72088e2fc3e1e4ee4de0e0320b45d7a1
font_02_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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