Malicious PDF — malware analysis report

Static analysis result for SHA-256 8971582b54c131dd…

MALICIOUS

PDF

99.2 KB Created: 2021-07-13 04:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 56fbe446a6a6e847455f062c4aadde6f SHA-1: 0d039d23969c7ce066dfbd837b5ec56ce22b5887 SHA-256: 8971582b54c131ddb1fe351332a14904417cba92cb42f037d39e1a2cd87cb53e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis suggest the PDF is designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://sdds.be/userfiles/file/70110917315.pdf In PDF document text
    • https://kurtoglumob.com/upload/file/96802528001.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc837b311f3---validepirurezitimop.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210531_B36C136CA4A19BDA.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4e5fee777---49039128821.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68959d0a3---18695131782.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/59795725480.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/pumevuje.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6211178a6f---seritovav.pdfIn PDF document text
    • https://soechi.net/userfiles/file/92037144485.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/84248444279.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/winejugobamotowoxuxutajiw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a959ecef6---tavusazowuvisagi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/kemexapitepaneminosuxufo.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/nemotamon.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e040df3e0ff---luzerejuxatemebawebugejed.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f6d8fb86---5983665752.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/30160296520.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab78c4b7b38---gurasebakatufuzofoga.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/63457876378.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jcmq8mo1ueqk6eaoutka7bjar7/pisenavuzuzazak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=meaning+of+designation+in+tagalogPDF 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_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10424 bytes
SHA-256: a1cb755a54ecf9feb2c1a144eb48ca9a26e40b6bdd37a6e4c1f45db38dfd21e8
font_01_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 18924 bytes
SHA-256: c99aa8c8b839856a771c56ed4d425819ee9d33f479e4c26bc7806e4d91a5af91
font_02_sfnt_off000165fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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