Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9342a5511eb28a…

MALICIOUS

PDF

80.2 KB Created: 2021-08-30 00:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1d9534f37bc57aec659df2fd4ae8dea SHA-1: 8b28e3c46d2733cb1761789d42e3d5caaa1aa935 SHA-256: 4b9342a5511eb28a7d835bca781a8beb368575207205d3c300f9dacdc5a2df12
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9b68619e---wugif.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087455db01d2---56071071370.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/wabugujixaxifopawaduruze.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/51fc8db674827dc0f33cbff1b35c14fd/xixame.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/kewalazuxutexatinef.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/vizevubo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/98780676782.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/94031919581.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/86690652831.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/1702500872.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/74788724443.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e07657c6700cd93ec12b36c3444c782d/rejarutimelipomarege.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160af88d281a60---difufirofawuxet.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/kidedo.pdfIn PDF document text
    • http://sarenpinler.com/calisma2/files/uploads/vojetemedos.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610beb45b8162---20566125067.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gesix.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/61790568376.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/14f6dadf91bf5692a4b5440c37066ffc/dewagokipik.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gs8lqsg3hpoiirb73gmci29234/81219506697.pdfIn PDF document text
    • https://activepymes.com/pub/file/wirupagizojakesebak.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/26761136455.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/10266873481.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7bb95d05a01bfb06376c7caa3ca3a776/53266109257.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607263253de52---xusulelisotekarubanegaku.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/77273176421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=binding+contract+in+spanishPDF 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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 10668 bytes
SHA-256: e394e21c7b5a82d6d550af639b7fa18f3ec72f91927cce38068c66e32d0f6949
font_01_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 19516 bytes
SHA-256: 384e7609f2644d4c1f27ecc66ae62f51066dd0a48215a44671120a0f819b4ace

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