Malicious PDF — malware analysis report

Static analysis result for SHA-256 437abd0b6dad3c11…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 10:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3c26783c96cc29dbe9bbec38a04ec2d SHA-1: 793e200d98c8e7b21a2d051b015c2331aacb428c SHA-256: 437abd0b6dad3c11593d2cf58313fc08cc2e8afe4a4396bb74f9736353dc25dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, suggesting it is designed to redirect users to phishing or malware download sites. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://landia-print.com/pdir/file/34602254693.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/34937787488.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/79817966746.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608494f27745a---8469531296.pdfIn PDF document text
    • http://alltechsro.cz/files/jinosubuxesa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd9c598fd0---26193177862.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210619155130.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608176d60e31f---64861544037.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35459247259.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/42870760489.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/f4b0be1201b00165b40ed69bb31331c2/xivozarofokajotimige.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/25810395721.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/22b9e22254403853e6572929ef762890/32675189896.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/90a047ed68d9b05de84b3285f741d5b7/1054095056.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0204fce7ce---sigozadudu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf47aef73---xaruvu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/67754455041.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/revovasujedalanobunag.pdfIn PDF document text
    • https://banghenails.com/upload/file/7915743204.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/78436710842.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210619160122.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3828a754---vufuda.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f34371994---26359887902.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/66049171531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=1000+bytes+to+mbPDF 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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 10096 bytes
SHA-256: 6c1a085dc190039a138ddf2125bb40081a6632c5d20a3e62f51762d73292e5d0
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 17316 bytes
SHA-256: 2a8f4972b4d102fcd311f87987bcf0c3ca984a17f864aec78ff6b094661acc59
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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