Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89c3412ee0d0632…

MALICIOUS

PDF

79.7 KB Created: 2021-08-16 12:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c3ffb5c40edc3b0adc80513f7aa9c93 SHA-1: abda61be91370c7584deeea5a8bb348f708d3fd4 SHA-256: a89c3412ee0d0632a033e290686dd9ee051b404d51b1e693030659f1050a6db9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://garageanything.com/js/upload/files/rijipakufogatupogifatot.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1cbd2b2bc---54617555141.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-23/20210723084358363429.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/31179473550.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/41846318968.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/7709791336.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/28514342293.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kusisex.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/bamezapadota.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/buvale.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e0b7f236---siwapizarubusez.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841291374bf---33989939783.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/govuwajizawegonubovefuki.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5054340629---bepodotatiraji.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ac8da552a29146e2ddc66b6599eff34d/67510100546.pdfIn PDF document text
    • http://aimic.com/userfiles/file/61167686078.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/vanolujufozoxev.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5122b2206de9605c0951fe8241984b09/rejuvonabowuxu.pdfIn PDF document text
    • http://technocom.pl/editor/file/zemivaxejuzuzefeliroxon.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/xebapisapepolom.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/40367701714.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0153bc68---10189650345.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021710818421058.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o713drkitfh4sga4hbdao0ggtm/vasak.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/32752128002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=george+w+carey+zodiac+and+the+salts+of+salvation+pdfPDF 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_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 18000 bytes
SHA-256: 2c3e0531e41a5f2514510d9b02698cfdcfe1ef76ec0dfa763168e4a59d3b640e
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 11264 bytes
SHA-256: 350b766e27d9cdd7948630b8eea130e7d5eb6c1b13bbba47cd0ef29c641e0f06
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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