Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c66de3e3361bb5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 08:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe2be55afe7dbb6e927b1295758c40a5 SHA-1: 3b66421939374b9cdcf425b513a61debde4b81d0 SHA-256: 70c66de3e3361bb588baacbe4e43606193eb763615d0fc59697fb1cbb776eae0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/de40edb8895fb3fa142727f7d7020f5b/kogodaxozirokejebimodizun.pdf In PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/42379726154.pdfIn PDF document text
    • http://altinay-law.com/images/file/13054884451.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/24497102502.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2fe6ac549bdf632a40d79157bb69a9a2/5889154590.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ecc06d163cfbaef1991e3b49f1a6d1d8/42137956556.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/dajezekiduridab.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/xodazasavar.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gdvqurjr6usg9tdpq5p0akjra0/17466521094.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/7l070tiluegrq7qcpt6qs0jpgm/48490486702.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe73e7feb---ropomidijawa.pdfIn PDF document text
    • http://talleresjpg.es/img/file/59089910755.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/96438810854.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a35ec982cc3ae0f36c42fe2d7171354/xopuxenasakubonezopik.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/63307084934.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/442a9ba914ef149dc652ed7626a277eb/99366395311.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8551276d5---menisubosuvabatovibowe.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/91bc055d31d2ad15086923fc468af6a2/54874164632.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/toruko.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/faxazedarob.pdfIn PDF document text
    • http://cakenepal.com/userfiles/file/83954337999.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nelexopekufudedaresu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ring+doorbell+pro+uk+manualPDF 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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 18192 bytes
SHA-256: a66aaa65392ab6d7e47b1f51bc9f047ad9042dff801bb374ba6497c7aae9dc09
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 10844 bytes
SHA-256: cfee4a9e060b4eba7f14101f27c8bf6d334d664ee1a775761de299ed5b0978cb

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