Malicious PDF — malware analysis report

Static analysis result for SHA-256 77289cd2c4cd7041…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 02:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adde4f0361b9ab376615d7ae85c4a95b SHA-1: 59122699070847eb7b796f9ebb868e80b899ac77 SHA-256: 77289cd2c4cd704117aecf6dd8f6a7d9b1c6fe48ddfe21e28c3bef07f8fc348a
96 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tm3krt5nc8dblvq7pjnv9tqec4/24400757506.pdf In PDF document text
    • http://agroanaliz.by/upload/editor/files/xafevanex.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109122338309258.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/nawopubev.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/6617789427.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/donizedutuzag.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/fitenofikametezow.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/84069414932.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/perabixoxomerip.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0fc2f1a970d4a644cf191c45b0bed813/miratijowelosubuj.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/9282062242.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/werafimutezaxebevi.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/kopafakir.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/27811450153.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/99375096052.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/zufoxozasifujazokuvozunon.pdfIn PDF document text
    • http://laduses.nl/image/file/karevodopafawumoze.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wekeveberujide.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/44551695185.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/65590742053.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vefupivavaviposabu.pdfIn PDF document text
    • http://irinabailey.com/upload/files/59963221074.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076df9f035---80599953097.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/webexofisumixodaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+robux+promo+code+generator+no+human+verificationPDF 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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 17776 bytes
SHA-256: 54946aaa0c12bed84eb24ad024372903da9054309db6d39aa43b3aa566972d9b
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 11236 bytes
SHA-256: 246ad72f92391c52bb5a436cbea0fafa058125befc9d239e177c23fb7681c264