Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb395ed72de26d37…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 23:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83eb352c985d964ecbfbabf40c29ed7f SHA-1: c940a93b5232492b043037076c7662b89f70e8e4 SHA-256: fb395ed72de26d372142cc24566424f053c63a3ddf38392ee4b3de38d55a4a4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure suggests it's intended to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://partroyfuneralhome.com/partroy/assets/file/28250676727.pdf In PDF document text
    • http://mega-treid.com/userfiles/files/66046079780.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210913/file/16315629091254.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/kodavuradanonejadimit.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/99673948483.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/fizoziretugo.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/59451168473.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/11443808245.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614387c081ea6---56291727845.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vitobepel.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7e3899e36effd1edf187e643e6498aad/14975304242.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/buxaludusaribowuxuzizares.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/muzakexadasaletupipor.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fgsao8bd7meqd3tl6jd2jkh0df/75470784489.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210914121555.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/dalixud.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_F17075ABFB26483C.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0cb06bcb3---silozip.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/puluwosizapusipogegakade.pdfIn PDF document text
    • http://bronia.org/userfiles/file/52104981647.pdfIn PDF document text
    • https://triosms.com/userfiles/file/7063213061.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161459b8745ad4---21806022492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=call+recording+in+redmi+note+10+pro+maxPDF 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_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 17636 bytes
SHA-256: 976ad754ebb8eee36f4232d3769bc405d681e31f48925a2762b500cd5be84965
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10996 bytes
SHA-256: de30d046eeabfc44a40e8b7cb24d1faafc6c5768680fc724c6e61a11081286f7
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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