Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04050e3001e0160…

MALICIOUS

PDF

69.0 KB Created: 2021-09-15 21:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef502e53e05513a8247bade3f8134bcb SHA-1: aa6557223d9158368ebd1e77e49971fbebfd98bf SHA-256: a04050e3001e01605b9d1860bac6e311e62228cc0c8b303d8a2b49cbcf7efd8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://estudiowebcolombia.com/ckfinder/userfiles/files/96837681694.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7077f4bc967df8dd07c75ec7aac71e24/59666613838.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404825dead7---merozuzodiwa.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/jutapiruzal.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/75130690318.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19734056084.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirorogakexotigu.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/24281304572.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/79937278082.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a781360d82---33822427803.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/ratufadebikosez.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/40879482320.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/mafukamegabimoxunon.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/87678990406.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/40181249643.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mopiwejifenevire.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/76723608502.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/medozorebodi.pdfIn PDF document text
    • http://grossbuch.com/upload/file/38557331986.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/ladepujoduzefexur.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/35210144846.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/sosanutezonoxezumujinime.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81910bbb6---58494204134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=app+alexa+downloadPDF 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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 10096 bytes
SHA-256: b0696e7f178f01165b038d90a736bc6774e3832fe6332eef576683ed0e989ce9
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 14340 bytes
SHA-256: 0eaf425be21d7600343ee6102137bcd192b9cdef3f4b49b44964f02acbb371f9
font_02_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1