Malicious PDF — malware analysis report

Static analysis result for SHA-256 e427f7a113a4840f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 16:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a2f7ae8443bb3b25cfeb7a8d455c4f7 SHA-1: 49db3fed6ad556ba5b1ecdf79e882296411e7591 SHA-256: e427f7a113a4840fcc0f5fa76bae1adc94f25a7f7b0b86cf3ef7ce5dcaece06a
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm hosted on numerous domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://studiogaleazzo.eu/userfiles/files/rigubapom.pdf In PDF document text
    • http://gowowdeli.com/uploads/files/5827965075.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/favawus.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/jalevavefaraxo.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/bujefitukavowekoken.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nizad.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/5817385777.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/repifepukovo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/60574099193.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/febunirage.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/gemosaba.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/firega.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sevotezawefewuf.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/mitiwilogajupefol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bed4bba17---sotubifuparigaboren.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b0bca760---73475415647.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vubuzakez.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/76104539097.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/11427412593.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mogekimebekubukivabov.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/27457812657.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jetapokaduzedi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ios3v2qkmtfaepr7oiiad0a226/pubipesimi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210904_F20A7581646354D6.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/masuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+hacking+kali+linuxPDF 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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 10528 bytes
SHA-256: 568eee261a300e16a254419f0effb09a9902628380504362b0bd6890c021c1a1
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 18652 bytes
SHA-256: c58a91824bc8d866e12a8f67778b23863b814018887aef57a044976fab17924e
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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