Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0c8d19150e850c…

MALICIOUS

PDF

85.9 KB Created: 2021-10-11 12:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ef1897f00bde6a1849b632015ed79e5 SHA-1: 91a3c8e922480589965c874e8a40467f45af0fa0 SHA-256: aa0c8d19150e850c35588b08b23ee88c5a9e6946892f255e55063045895a4cfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interaction, potentially through embedded JavaScript or by luring users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://srub-servis.ru/userfiles/file/bobixeluzowalisike.pdf In PDF document text
    • http://nsk-nalogov.net/upload/files/vususu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376fdf792b9---fivop.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/selutoduxiw.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/goketefalunegune.pdfIn PDF document text
    • http://skolky.info/foto/images/file/ropitimev.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096ebc0fd2---sowidozijux.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/zuxasopojokisenegupuge.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sndg5be90mjkvatp0d7lqt0fk7/foxufujovenufitere.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/71647228807.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a19d3d2ccd1056e523d9710dd606e10c/59980637904.pdfIn PDF document text
    • http://www.bash.cl/media/file/siwumisexukisugagaxuxo.pdfIn PDF document text
    • https://ms01bet.com/contents/files/tevil.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-10-3/20211003101046139997.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/geveniradawefu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/60132198561.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/setewe.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/80602076101.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158bb182790b---masutaka.pdfIn PDF document text
    • http://salwex.hu/file/tisalakuzalalije.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/xeworanot.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/77360828070.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/ponun.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=hale+in+englishPDF 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 20088 bytes
SHA-256: 3451fba2f8439d046c524f14f77f8254653739bebccf6e2ceda1cee5d02585d5
font_01_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 10060 bytes
SHA-256: 784db56d4ceda1081494e0a0181b127b53298c6db7efd863d1bfce9b837fe448

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