Malicious PDF — malware analysis report

Static analysis result for SHA-256 78936d2ed622be00…

MALICIOUS

PDF

106.5 KB Created: 2021-08-04 02:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ad5412de4dbc3f1e6e035f1fb680e94 SHA-1: b5e7ea47b135cd50c511f712305bb5cbf8259640 SHA-256: 78936d2ed622be0018229281cae461e8b6a7d5cd9233b0ea98f27e107be3c625
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tjca8il7f1qppha12udif6bos6/93121241894.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/9038448496.pdfIn PDF document text
    • https://maisonforville.be/documents/file/13051207499.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98f7d3cfeb---55441881640.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfa8197b87---zototibewekuxorolu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97f1f2dc3---53321221772.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/taxike.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/setuvesijifunimepalime.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349cd53402---51158039460.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/i0sg8km4jktf7da8gro6qunqtp/69704665462.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd357172174d1c4c318d390f698564b4/lupufelezexisikejanek.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210706_8FF2D40ECFCC5656.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/43733802854.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/12281667810.pdfIn PDF document text
    • http://cycling-software.com/files/file/mizumogimazunixowaseletu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210616002053.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609522b73dc80---kenojiwijutugajimup.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18299201086.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbec8b367---14254885447.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xekosevimowotejupegubave.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0ul9fra68t49iuuskoflc1ciad/jokasisenaxinosonamevas.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/12526973581.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e0d91481c72a9b120642af782048541e/92076234496.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160994728123d6---satowibabolosafexadujez.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c9cda4080afe2a6af43d68546cb5ab09/81234160297.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/60182249059.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/birawanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=descargar+peliculas+de+accion+gratis+en+espa%C3%B1ol+latino+youtubePDF 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_off0001359a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 11252 bytes
SHA-256: c3520e1710f825851fb263aabcd6182bd414777f0ee18dcdd36f98b5dfdd6d44
font_01_sfnt_off00014f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F78 19176 bytes
SHA-256: bbe1947de6147d926212f8d9d1dd5ec3182cac40b09717d314a68c67ba289843
font_02_sfnt_off00018040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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