Malicious PDF — malware analysis report

Static analysis result for SHA-256 905cbbece00bac19…

MALICIOUS

PDF

93.0 KB Created: 2021-07-30 08:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d3ca5c0dbfb3eb6ac6fac3f72cd1cb8 SHA-1: 0451f9b356196479a4a74067c6708c11b5052a94 SHA-256: 905cbbece00bac1997ad4bce3013d0b552f0be728a4eb23c111b984df1d1aa20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e67c303f6---nabitabizidixefufit.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dffacdfac---95314762859.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/ledakimelefijaxosadure.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/dimututigusebiwotezo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5db704a3d3860ecd99984b39d2be86b/bibubiwinuserupigolug.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e8bc0a65afb7cc1ab0074f3a0cadb0d3/26642574913.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78fae7820be132ba6057f09c3ac3efc3/95220872155.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b610efb84---58513445171.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g9h6pisth4eg1gti6upi94fhkr/girijisatuvorowu.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/89351861269.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40797516194.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ddc339a7---sisanilepisunivuguletije.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/rulekupasaxuwupewar.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3f8f9c4f6c239f8390ec22bcdfd3628b/26462987768.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gch7st4dvp4lr8ri5k4756ae0s/89009085254.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/detodu.pdfIn PDF document text
    • http://distributoram.com/files/file/87066759367.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/55540633149.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/rurewakak.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/5326643169.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/wofesojodadera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=antik+m%C4%B1s%C4%B1r+resim+sanat%C4%B1n%C4%B1n+yap%C4%B1lma+nedeniPDF 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_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 18904 bytes
SHA-256: b193073a571ff77aaf6233453849c1f53f2b45141b7bf3866a6ea32fb80e48f4
font_01_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 10664 bytes
SHA-256: 57775f5e56d1726b6f25e532d29769e96dfb34a3ac6cfef6226ce5bdadb32a39

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