Malicious PDF — malware analysis report

Static analysis result for SHA-256 36612a51674c20a1…

MALICIOUS

PDF

96.8 KB Created: 2021-09-15 11:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33d8f8846e4b5f31f33ea694cecf14b9 SHA-1: 90a68b66010ea5d7545c5dc01cf4a16223dce750 SHA-256: 36612a51674c20a1d53d6204ecb1efa9c7576fe673bfe4f3c56fc22d572c2cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://laborke.ru/uplcv?utm_term=nintendo+3ds+free+roms PDF link annotation
    • http://thietbikhachsanvinhhung1.com/upload/files/84533052236.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210910185253_eGlnYWdlbm9ydXNpYnVy.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25a800994---38193785573.pdfIn PDF document text
    • http://sinoorchids.com/image/file/13003054819.pdfIn PDF document text
    • http://orem.mn/uploads/files/8900352329.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fesajadogegojepadofavub.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/87669625870.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/sominigalenale.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifodujugefebisas.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/sedogenulal.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/doguveg.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/1341076280.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/badetiwaximonotipibajuvub.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fowemaxidixedojanok.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/31152434200.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/mevitas.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/93753665723.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613030b4ce109---zusuvasug.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/vawapi.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79256641776.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/e92qm9pjkd4oq59vnuspgbc0b2/85572101017.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feef2e3af7---48828623389.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zenilumite.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/sisadutunadulit.pdfIn PDF document text
    • http://change4best.ru/upload/file/suboseregawaromuru.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412d61c76b0---15030674102.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_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 10456 bytes
SHA-256: ed065c34dfaca501dcf8c0513ed1c016c76ceedc9f72f45ed5f97daa97ee3058
font_02_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 18372 bytes
SHA-256: e5b19a86e0b2ae98c27a893db9149a52abdb169d6534601e7ed8f97a7bfb6205

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