Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd0af6ef27cb9a3…

MALICIOUS

PDF

105.4 KB Created: 2021-10-31 02:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 855b65a61fc17f7c1d4cc7fecdae7bf6 SHA-1: 0ad02859ee7e2f2bef0042080c5ec9932b3ed8b4 SHA-256: 3bd0af6ef27cb9a3c0a5d3bdd1b7112a42604a018bd278f79fe1c3039b0cca0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=types+of+digital+evidence PDF link annotation
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/66291713886.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeaf88d1b8---42448913459.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vegadewi.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16327256321424415911.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161491dfc3a1e2---xavutu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/jazebek.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/20764848123.pdfIn PDF document text
    • https://insp.biz/img/file/85610986196.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/javoboxudojajumewu.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/86750359224.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/55050104868.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/41298629191.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/duwivuwamimipototuzawix.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/mapigefasadimu.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20211024111957.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/nisamu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/65693617053.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/texodoki.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/subojuporozalunu.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/wurisutir.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/visolixuminusotewuxim.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/dimivulukabevixiga.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c53c904570---jonezufawavug.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_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA9 10840 bytes
SHA-256: 2f095dbad1bd47268bc8dbb63569e4b392d0e877680a16a81a33a7526e136af7
font_02_sfnt_off000167a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A5 18276 bytes
SHA-256: 9e78d3543eaeac247d8405035a59d3479926dd6e15170b065b979f3b31167f98

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