Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c6d5c4d5a86b47…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 14:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2070ca8b06ef3c0cc2ae7f5f0022af7c SHA-1: 34120bf15ce56a1527acfce1e2c09ea1417f9599 SHA-256: 08c6d5c4d5a86b476572e182d72dec206eb6f38550070b2cfbd21b4982d42375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=3+important+things+you+learned+from+playing+striking+fielding+games PDF link annotation
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8fc5865e3bb54459be4ff01df76dd58e/rarasineregiwe.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/divunel.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/gaxisisepobapuperar.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/91172986739.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/83781677182.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/74754499167.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/vopenudabafubosizolitutag.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/talejivova.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cecd465ee2---28081662676.pdfIn PDF document text
    • http://nessium.net/userfiles/file/zofosumeve.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/xebitatojovurederipata.pdfIn PDF document text
    • https://medius.sk/userfiles/file/99298425086.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348048da5e4---74045325360.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/fabozuxalusegedigivo.pdfIn PDF document text
    • https://coluer.ir/documents/file/88801627099.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://dgelc.com/userfiles/file/20210929195214.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/vutidutafefuxeretolutaras.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/bomilititatowolimigu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tugenelup.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/kekeg.pdfIn PDF document text
    • http://gns3.swiz.eu/files/editor/82850558420.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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 11324 bytes
SHA-256: bd24c0b939857dd728b52e3fc7dbb92e85d85c2ee3959c9d15f1790351a4a741
font_02_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 14140 bytes
SHA-256: 7fa78562edf622a91b4219fe82a6e3a48926257ac2dcf054b75f35b791d2211b