Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c16e13a08061c4…

MALICIOUS

PDF

86.7 KB Created: 2021-07-29 09:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d5acaebdbe107219b1ff21b6a55d953 SHA-1: 1bf1dd308c44c7eeff6908c11924c5cbe2ed45b9 SHA-256: d8c16e13a08061c408895333d7e31419fd64da6ca784fce2f710225831f488bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The primary attack pattern involves directing users to external URLs, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=how+to+earn+free+fire+diamonds+in+free+2021 PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5825aca06bd7928558738c4ae75f2e50/sovix.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a25a549fcf96e2157fde55cb0572d3b9/vefovimivamafufaj.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/rivisugatopuwilorenul.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/48674717368.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/41817225428.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/rozanilalefitajim.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/368f4c5d9c36dff719a2ee11007906a1/zonekinutibupepuli.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/574ab6d7572d3d6e117a6653397b7719/87174954996.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/6537487508.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/81483536478.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bhotrhikc4au1e1i8lahljt28u/gixufupuzulufikusanajon.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/menuwas.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982ef4e64c.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/66eb7fe767854f0cf782b2ed2e1c01c0/60671201059.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f878645105a4885c6e7b7468478725d9/tiwuresusa.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/47109541831.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/vikinajirup.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8001c59b---zitomesobiketasuki.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/79947103229.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/zapoxuwalixof.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/xejikugedamoketaxutulikub.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zosenerupufotagu.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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 17284 bytes
SHA-256: 18e1becdc76ca7790dd42fb5f9d3f81e587381bb0b41af87647d2abb79c9d083
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 10840 bytes
SHA-256: 3cea1481d08f0946f640f3d4c7021d8f82939b1c2c138079e189fa0f9dc286b7

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