Malicious PDF — malware analysis report

Static analysis result for SHA-256 3429dbfb709525ca…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 14:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd36bbe5427018eef75f2c1db869710f SHA-1: 3ab04c992497910f6678ec80c2d604ae25d9cf5a SHA-256: 3429dbfb709525caad272db5b03f3b6aa2b81c53b88016324a266ffd57210830
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself appears to be a lure, with the document body being unreadable binary data, indicating it's not meant for human consumption but rather to exploit PDF vulnerabilities or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d715af22f---figewemebup.pdf In PDF document text
    • http://trans-serwis.com/userfiles/file/wutiwepumuge.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/34657880064.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5554dab824---kakozufajapugumivobe.pdfIn PDF document text
    • http://etkenkalip.com/files/mijeton.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9e5bc397---84924594699.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/37fbc24247b0c626c3de384864ce5632/43535428793.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/86005066938.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d086fa0d---6654795346.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/pisajisadolazovokij.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca51bd02c---dulejixojevawisamawogu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/sivudubixutareviv.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9655a370e---najefaz.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/26089484534.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/kusorakabaxoparafinex.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/rajitoralezimaguvesuruv.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d35cfe988f1---76208385076.pdfIn PDF document text
    • http://whatdwellswithin.com/file/ralerun.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7b2a6ba84aeaf426fe68d948b4c96c48/54557629323.pdfIn PDF document text
    • http://vizcsap.hu/files/file/66021045637.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef941a47f---pakavebofaterinum.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/r26519os2rdeep8en5neasd76u/talodisatitepeson.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/od32uhfjmv6gel27c690937vj0/jamolexirutarerizazufisad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mattinata+tosti+pdfPDF 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_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 10208 bytes
SHA-256: 63ad4b13dd4fcc936d872f1297cc480288f8f8f051d5d77fa1e941663d3af0a1
font_01_sfnt_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 16228 bytes
SHA-256: 7c4e480d878444a24b54a13a5f8abe73efd8fcbd267b4f90d828b9d4d42a862e

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