Malicious PDF — malware analysis report

Static analysis result for SHA-256 667cbbfd24232a1d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 20:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 02a269d1b957f9150179ad6c958e7948 SHA-1: e329fb6ea40eb67dfea4e978d8eef5b7450cf56d SHA-256: 667cbbfd24232a1db9c6289814911c67007c54c196f396b2fc9e4f4a10e85140
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cihangirhotel.com/upload/ckfinder/files/newimavotuxezar.pdf In PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nupodefoxu.pdfIn PDF document text
    • https://scalper.ir/data/files/file/zavotedosig.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/7586466612.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/99713770275.pdfIn PDF document text
    • https://funke.be/data/file/gowopigosifivekenaba.pdfIn PDF document text
    • http://imi.vc/upload/files/31950599873.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/50191315500.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137891be0a1b---17066058446.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109120156098828777275y6wgctew.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/50509299985.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/gozonuzebuxulabimorakexeb.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/kakenazo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tokpv2k4suuftg4qf8oanahsd3/gizemotivunebalemijonufa.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/fuxebajarosife.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/58348725201.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/fapipemizijusodafezafop.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/45007246176.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/jusexuxerixapegexaz.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/79463693469.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/xijof.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/958c21af23ca604b79fefd69595238c5/37244484122.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/xusibogawoj.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/gasimavenix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=yoshi%27s+story+rom+downloadPDF 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_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 10596 bytes
SHA-256: 8e4cc51ecf9d5e83ab23e962f7d7ccafc82c6fe516f3ab3952ae250e91d563c9
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16188 bytes
SHA-256: f836a4f290a03111337bbf15ee1334455dde4a2f6fae945d2c8cd7f1db09fd99

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