Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3f5b0163120011…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 00:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 580a3ac5d23c0d96e70c61878b53f548 SHA-1: 8083d47c9f413b8a17dd097b7564a6446cf305f0 SHA-256: 2c3f5b01631200118fd3edbf36eb1339c4a8446bb9aec15e21b0d72792c5584c
126 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many of which point to compromised websites or disposable hosting. The ClamAV detection and heuristic firings indicate this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to lure users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.1277

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ylplj.com/ckfinder/userfiles/files/vopopakobokexireleferafa.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/47892da7d02b5921a58e919bfa6b0140/lekawu.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/23740269543.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ef0b16f---6700172115.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/xuralefetoni.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/181de5cee50103ea731b25890e9a2e2f/27679183967.pdfIn PDF document text
    • http://e-sportis.com/images/upload/romaxexilajidit.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/26924724279.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/84833981337.pdfIn PDF document text
    • https://music-group-store.com/upload/files/56947322679.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/59403550435.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/37349803186.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/64938020478.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/634a835b1e77d5a465e00c79fed028e2/pezopabawarot.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5dd29c566745d7a7c712c22ac0dd00ca/fegogopuvakiduxe.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/26467014188.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/57392624241.pdfIn PDF document text
    • https://electroagro.es/pub/files/66538060395.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/50113902535.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/rapixadizo.pdfIn PDF document text
    • https://blugarden.eu/file/85277609211.pdfIn PDF document text
    • https://digireg.se/upload/49797951689.pdfIn PDF document text
    • https://diphong.com/uploads/80133049259.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/sezusezowoxilejamovijila.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130029a8d4ba---jugetinapobozixifimabel.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc828a5eb6---vegusudejona.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9c6398ecf9e0f488c6b84edf6db4ff6e/81235498340.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ribuxuzizisogevawalekub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pocket+rally+downloadPDF link annotation
    • 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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 17624 bytes
SHA-256: e30c8ff3680a06defe3da43e21daeb044621ed9ad9011cb2ac68c82bda891e25
font_01_sfnt_off000110ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 10396 bytes
SHA-256: d9464959c1d54f5d5617b0ef82c5278662f1427090456160c4b1c54cc135c0b2

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