Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab4c0511f9918eb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 03:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b008cc979865fcc3862ab36316ffd1f SHA-1: e2855ad7d003c9d8d45858c7a8b6508b11b7cab7 SHA-256: 1ab4c0511f9918ebe0ce9d9fe80e30d66d684538eeeca93fd8e2d763ee0a3ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://drivingschool-brno.eu/files/81495567800.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/b7cnagra374et41iph7i8s7r08/64399349116.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/deedff4ab2255709d140a52922fc6105/94237059662.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2695cf48---16234433862.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/sojuguni.pdfIn PDF document text
    • http://df-2.de/images/daten/file/tuxuranavega.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/17cd872e2385bcfd3444946659a225e6/puvozubufagenami.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/fiwerizofumilofexazifegi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/juravenapotevitob.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c77ddbed---99755129178.pdfIn PDF document text
    • http://net-marketing.hu/images/files/pesipu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b65b22dc172---pakogadifodapedadib.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/27001304925.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/282952106.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sufije.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/54012089461.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612b49996097a---35162233462.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1e2e9a959---83470046973.pdfIn PDF document text
    • http://biosite.ru/images/news/file/28290853357.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xotoku.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pududaganuxuwifibovopadap.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/9304119885.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/3145422521.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/belozukuzofaxefube.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/65133513840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=white+crowned+black+wheatearPDF 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_off0000c5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 10608 bytes
SHA-256: d15b2b08cf4f00c647186ba914cda555d801bb3927ae92a1d2a40c60cbf07883
font_01_sfnt_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 17124 bytes
SHA-256: 46684c47d8c72d6bdda7e73f5349739f5631567a931b63cbb69561e75ffe9a87
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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