Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b34d9d9ca29ffd…

MALICIOUS

PDF

81.8 KB Created: 2021-06-28 22:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16dd9f7e2f8bb0885cf0b265959eb3a2 SHA-1: 71c0b6e63b8942939062d944e3e3ac4b3cc20c32 SHA-256: d1b34d9d9ca29ffdd6caad7cb0a86a750c802d8c7447ab6c3922fdd3f524ae06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://shriayurvednagpur.org/public/ckfinder/userfiles/files/8198156758.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/7211468757.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/nofowewolezo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/smf5q7e737qkctoseip8vfjm4t/kugawo.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/979285803.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086feab28bd1---wubatosuzanaxuki.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a120503ba61c81de3724c3e131ddeb/wilerolilifedirukoz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807aa0c2d1d---dimatelejesawejebopen.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/13e056fc35f55f37c37e0e21948b428c/wowodam.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/33835761205.pdfIn PDF document text
    • https://triosms.com/userfiles/file/karikuzawunekelagixi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b08df73403d---kixomoxugomo.pdfIn PDF document text
    • http://benrassam.com/uploads/files/jivakebigusox.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0751ae408---38511415209.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e993867f---fipugabopelone.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a970215a18e---tekigurin.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/80913366303.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/pebimejolerajadup.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/jejewobotofufud.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948e1a1b193---57510317680.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/5g040itmgf9glk62j0hrpondld/sagev.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d609f34307---widakemibore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+combine+pdf+files+linuxPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 10936 bytes
SHA-256: 97e3b8d130e2fbbb8c3c805bd91cfd565daec5900b026285a496e4f7376824bf
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 17160 bytes
SHA-256: ffd5fba4d87245ef3da6ec65086f7c51cadb2e1d4046c62e74aaa3f27a31a395
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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