Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d62c3a4190fb6c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 07:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea83df8c3f3537fc22833acf59aab6e6 SHA-1: baab8710d1b4941deb5c330368d7ceb9da53b6b7 SHA-256: c8d62c3a4190fb6c8aeed94da010ed1ee3b608224b655849a46c5f9d3c7ac083
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to potentially compromised or disposable hosting. The heuristics indicate a link farm designed to host other PDF files, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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.
  • 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
  • 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://sciattella.net/images/file/vedutisiso.pdf In PDF document text
    • http://artetendasud.it/userfiles/files/xugilojuzazu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/abadb2o8o0nan7og66l9le3kn1/busikoniwadudusamopudido.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/67024554871.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/18760953486.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377fe58b03d---pewilusa.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/5346372944.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/zozezibux.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/71290438246.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/bagin.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/32084022318.pdfIn PDF document text
    • http://ukrfirework.com/images/file/38508949334.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e164049be76e54788189b52d71e1ab66/37188021706.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mujulexugavixofodimuzuwex.pdfIn PDF document text
    • http://pneusmarene.it/images/file/lolimut.pdfIn PDF document text
    • http://innotack.com/userfiles/files/14989750770.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/dugebajuzafe.pdfIn PDF document text
    • https://www.znackakvality.info/files/68318399500.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/85080322993.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jowisafewujadeki.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/15684690373.pdfIn PDF document text
    • http://ailizia.com/userfiles/3808979508.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/32718808685.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/tupusabidux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chapter+3+research+methodsPDF 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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 10740 bytes
SHA-256: 32ac489c4d39c3be222aed71d1c75a44d545edd9c92ae7af435c3f40fe9070ab
font_02_sfnt_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 15684 bytes
SHA-256: cb59515bf1f55b9e8053baecc34c90d80aa5ccb8e55ac9afec92c373e84d8102

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