Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e56be48b514ceec…

MALICIOUS

PDF

113.7 KB Created: 2021-07-21 11:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52b6bf5ed8da86b62d188ada7f3371e7 SHA-1: 8bebd2d0af3556ab5e1d68b5307c8e403a17eeaf SHA-256: 3e56be48b514ceeca89242ce5636fd2bde5e48219f7663091171b6e59cc54016
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://azizolace.cz/images/file/31411998884.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd48907fa0---87521597428.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e81c940d0---fifudaxubulisorediw.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/23511435102.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5799319d---mofolikeronimoka.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/866fb907280d3d17d2be8b635cf46509/favob.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ccfc54d5ac6c7d4bf357c2912d6802ca/girugemabo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c6853728fa0---nagegawumexipogabuzigige.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/p05qpm07u63rd2nj0k74te39lv/wibutojedasufarovegajoja.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08fef77ca9---tiwokidixu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2d96a382---gorusuzoxesedodiko.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589352b208---24216247659.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/wagekabekijuvoliz.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70ec54cf3---6968093616.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc886c732---75028672197.pdfIn PDF document text
    • http://89.161.234.22/ckfinder/userfiles/files/musevi.pdfPDF link annotation
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fa590e859---gavitugewopejikarokeni.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10c2e66137ed1f92930978f939f646ae/93337711008.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/lufopivatu.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/849986564b63e5a0f51352f6a47d6157/waduduviliboj.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///9357775397.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g3rgene0rm7aflslb79hf5in9r/fumuzoraduxup.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/dd509dde58bde99179e90567b74e3643/24353799648.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/modasojafonolufuwevama.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tqejiku2l10kfe7dfphhr5ii02/zafuzuzo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/wuwejubujene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=roman+conquest+of+gaulPDF 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_off00014f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F45 22796 bytes
SHA-256: 4024fccf5b1e32cd2f84fb4be4601d2451a4c4c7a8321fafb5f24a1f6aba35f8
font_01_sfnt_off000188bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D4 10780 bytes
SHA-256: f8dbaefdc9c6ff96264fd3c37382cb30856997f66bf0f12dc2242abc05a121f3