Malicious PDF — malware analysis report

Static analysis result for SHA-256 854542be7a13d052…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 17:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 060abf03c1fdb79b0b1c645de05694ee SHA-1: ad2a86e8b825925ea816e7f2d8f283ca08520fcf SHA-256: 854542be7a13d052525f4b8d033f41a9e08598ef4d3a6b7aa4c28f3b3bb5854c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tt-ural.su/admin/ckfinder/userfiles/files/sapomizobonugaj.pdf In PDF document text
    • http://szmchem.com/userfiles/file/22922149994.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/90224841398.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/wisimavisorifojedixev.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/solirifi.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/6691698195.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/navokex.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rupesozonunovukoxo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/85130265817.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/robivozepavozovigeku.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/58gc9jgdkgpnck5ssnn989ea43j3itf5/famawevojatoxoxuvek.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e3c94b7e560a2364e73742a3a4a33557/71346443147.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/51600102458.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bosibagum.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/81817248039.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/84924126746.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/mafofeku.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/57343761470.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/10425517302.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120936384308.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/95860921055.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613681a350b0a---64152325896.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/24901117161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=file+manager+on+android+phonePDF 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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 17620 bytes
SHA-256: 4270537ad99a28bc365158abf0da226ba8191c28afb477f69ce9892f1fd256e1
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 10548 bytes
SHA-256: a2d171fdd451c9d39d98ff0f66b7bdb2bb4ef86ceabe3fced38f6257046e5dbe

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