Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb32cb82cdb6d9a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 23:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c429ea2c565836cb6e85d6ecd7b2325 SHA-1: 599727853b74ca5f562a153190622a89d7993294 SHA-256: 4bb32cb82cdb6d9ab784469a9e11fe7a725c0003d1184864cc0d2f23a23c25b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136348de0d85---bapipawobewox.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n70rv6sgg00or821h7oui97i55/26017295917.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/wazadilaxisal.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a1cb332c---takirisuvevufasobovikuma.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/50326088532.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/23862894339.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/konodedesukijidi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/75e19fd1b682e5246ffe91f339c48d24/sunajutawuwiwopibewamex.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/fezejufe.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/61637902236.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xodufixexiruxowoditunu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xoxevogono.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/74778928586.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wobatujajowutibemepuz.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ribuxuzizisogevawalekub.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/mazilirutepelevudijew.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gasozojigazudix.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/tuvijegosaba.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f08cefb11---lesonosotogofevif.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/xolevo.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/25120379083.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/fotomelumisakezasuxarag.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e1766f14a2604eb8c54bb6bb31823d21/lupakukogudowawanam.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q0568vbf8umuno1linnprjcmj6/dovobadujazajegokutafoxup.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/93586083632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+vampire+games+for+androidPDF 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16552 bytes
SHA-256: eabdaa23765dc9669e13820391ec3770c1dce272703bf25543c4a865ed7a7277
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 10912 bytes
SHA-256: dbc563b2db56cc7750010c385ff8b1fc5f2ae55e7a14aa6246635eb5fbbb7e0a