Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1d30388cbd3259…

MALICIOUS

PDF

64.9 KB Created: 2021-09-25 03:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b9a14ec507b1fad398520a3a40000b0 SHA-1: 028313623a91ab08cafed38efb5b963e2ff8f26c SHA-256: db1d30388cbd325937eb42cc7a44594b9dc4009cddedbc9f99781edb863f803a
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, with several heuristics indicating it functions as a link farm on compromised or disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://beijingxinzhi.com/userfiles/file/20210901071430_1336696146.pdf In PDF document text
    • http://eternaseguros.net/files/files/bibalib.pdfIn PDF document text
    • http://rapet.hu/files/77673882473.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/tomaxunoju.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/gekevusonikawuxiboronaw.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pizopobusumi.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dafinulekabezopabizalimo.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xanetaxanesedilid.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb2acc6da---mupafulisu.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/63575730545.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb0182648---sezasesonepozega.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210924181118.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/vozinit.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/39118774605.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/fadupavikabarafaj.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/53584833977.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/pigojizavumapep.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b04958c655---35510921844.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/pedifefifakivuwejewor.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/44420942855.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/6651730764.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/vadufisewal.pdfIn PDF document text
    • http://rinsacars.com/files/others/xodovuvobenokajobitili.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/mokesuvupadojisemibefej.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/dibebewelomiroduta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=drop+dead+fred+full+moviePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06F 10456 bytes
SHA-256: 66b96e81c688b16a90f2e18b4e2815f640f61f5034c5ea7bfffe77f93690a24c
font_01_sfnt_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 16840 bytes
SHA-256: 75aedf470ce3d63e9834d59e18e5d4e60b6ff5408a834ec5a22e2b38ac2806c9

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