Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe5a19efb7a3a1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 21:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b2712cf2e238731bf7d912cf3409103 SHA-1: 181778c03bfdc177f43c70a750fde0110f904f51 SHA-256: 0cfe5a19efb7a3a115ca50630fae6fc5d0a6d12d96b37b5094ed7d6757c10373
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to disposable domains or compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farms points towards a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=merge+pdf+logiciel+gratuit PDF link annotation
    • http://naitikfashions.com/ckfinder/userfiles/files/demug.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/18435299207.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/viliweleximarozitiza.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c21e773f209---segagoxizebajesitizemi.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/15099864926.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/47948895235.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/98481375021.pdfIn PDF document text
    • http://sdds.be/userfiles/file/zinedixoregefixamorul.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/gosedaxede.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f4778352---diginebexa.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/luribuvonirex.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/zikigap.pdfIn PDF document text
    • http://contextuae.com/resimler/files/bedavinujetapuk.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/53280577250.pdfIn PDF document text
    • http://chikatere.com/Upload/files/20248485698.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71a904303---66163717426.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/moxuwopari.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/53230434977.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28166337159.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/19759210796.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210610170159.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/27287763623.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c753b97d0---16690266529.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j3c9fsfj4rnncvsrjjurhpokhb/bevojesedaforukixenegus.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/26027550e51587e40d0d0f9e1ef43e1e/85495010613.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f89bbd7aecc87a4e142f126b03ee3b17/ziliradewobizajugu.pdfIn PDF document text
    • 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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 20240 bytes
SHA-256: 007b0e6221c871166b5a7ab90e1c7f3130844a38bd3477b60af546f995976502
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 10616 bytes
SHA-256: 5a6e84f41e952d6c68a06670cf6fb803786acc45c0ec964d0271af80fe090952

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