Malicious PDF — malware analysis report

Static analysis result for SHA-256 e437579c63ff5ff0…

MALICIOUS

PDF

73.2 KB Created: 2021-09-02 06:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eabd0dec9f8c0259ebf51cf15ba25408 SHA-1: 55dfdd84fa4d7c0a67097e62d3fabb0b53947cd6 SHA-256: e437579c63ff5ff0db28d29209fe9fbc8effe7d42ec1c08b2161e354927c14b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://aftckwt.com/uploads/file/12488082889.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1ff604ecbf725be258633170b42541b/vilafafojajejo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/88358d4677bcc2e467199565142c49a9/65223122527.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dimutaridalelazavav.pdfIn PDF document text
    • http://fructusartis.com/i/File/93381182711.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe0a3ba8c---lomewezaxinunesox.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7f0b8d69---reniw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/333s66pl3ld2tp7g6gp1tilq95/fisujarijofinezakigala.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/csn4o2etu6r6m7cac1aj8b5qv7/1030551405.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/tegawezolepatazatirefaraw.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2ekl8pkihbjkdu4gv0dqv9s7ec/24335242838.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e4d236ede9dac0923f2532a636a3c4fa/35022470429.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9mfh81mtvvr0m5f2auf19k3j4a/wovap.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160758bba77096---nigepavedaxebebejivabeta.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/foxozarevofus.pdfIn PDF document text
    • https://wonkingchina.com/d/files/48321995239.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a93bd0d12f7---31544896226.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/15947035072.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/23826595271.pdfIn PDF document text
    • https://ovalpolycoats.com/media/lukojowujokefetum.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/82931528368.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/32385901101.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bd2ee0eea76754dcb2c86d4bcf3e977f/48575225020.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/62457099858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+great+book+of+amber+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_off0000ba37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 10732 bytes
SHA-256: 0f962e3828de592c808fc4e958a573d348fcd69d66cb1e6d8e3e7012de501a25
font_01_sfnt_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 17360 bytes
SHA-256: d2c6dd7a454eec04218e7a4fe2a9c9affee67aadc180d1d525839670e6b55e92
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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