Malicious PDF — malware analysis report

Static analysis result for SHA-256 802732c03bdd8b04…

MALICIOUS

PDF

75.0 KB Created: 2021-05-24 21:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55fc5c97a01e353661bc217f2a6fcb0 SHA-1: 0003ea9748127de1f2a0f2a9c9c006be0bd8f83c SHA-256: 802732c03bdd8b04108b4a5e9ee7ada44dc8150b84bf8630c4f1771c57167fad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute phishing content or manipulate search engine results. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rgkuoiucgrmtod9prmh1l59e2k/fevujupulev.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb3c654f6---86795350011.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2dffbfd2ea188f30dec6eb90a05fde56/muzes.pdf
    • http://www.findvoters.com/userfiles/file/dusogiw.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2669c15574---37207296695.pdf
    • http://skogsformedling.se/bilder_umeny/File/85933908033.pdf
    • http://perlawarmii.pl/userfiles/file/22686290094.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9323dbc29---55899867934.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080470bdc5b6---kogamakonelesijuwifupof.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb51eb80ff---xekato.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/888c0672fe65577f402e23e4cdd74c7e/rosobidokudeziguv.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1abe5974---29884384126.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160710e8094c94---15587198170.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/r91dai58b5qv378c30f9hakn1f/84134631733.pdf
    • https://daaeportrett.no/upload/file/10160244222.pdf
    • https://hospvetcentral.pt/site/upload/file/nutobages.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf25815670---57312395306.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=2020+bmw+x3+xdrive30i+oil+life+reset
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e767.bin
a75918614418f07d9dca905f636c52363f0c2f2fbd6acd38cc9a24acd4d98faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 5548 bytes
font_01_sfnt_off0000fa49.bin
71b32c7d36e37f0bbb2dd37f8b4572fa2d40df21f342e759c1a61562df4c105b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10736 bytes

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