Malicious PDF — malware analysis report

Static analysis result for SHA-256 b701bbd02393f367…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 17:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d043631b9d5a5af721da6cabb4739ca SHA-1: 3ec0b556cecb573a4adb0ed9cf2cea825566eef6 SHA-256: b701bbd02393f3676a842b8adb9f479ca8722d7785f30701a0769665390b3c8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure, likely intended to redirect users to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://km2804.com/ckupload/files/65540793251.pdf In PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/92540597136.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/mesuguli.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/tokutotabakiz.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/60553195684.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/89583393557.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/gozupifede.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/87803185841.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/14173813943.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961a1cc93e---25418198106.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/lotulejoduzotuzibibo.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/57829299447.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613520faeb90b---22940608770.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210906154938.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f91af498---funebizok.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/16094128300.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/61455545337.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bexofanaparogefa.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zigutotavikireradajexew.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332948c080c---wodalesagas.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/92847961648.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/genojarumigiveletamove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=backup+text+messages+from+android+to+computerPDF 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_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 19704 bytes
SHA-256: 59866e589939d4a1865e9dfb8516145c4e657416542a9dd25d1106a6efc3ec13
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 11264 bytes
SHA-256: 3969b20d7d85d264c9e182e6e224f201076d7739dbe727cf7650613f112ce464
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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