Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf497e867f897ae…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 04:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b513045d02af093230f8bb8dd23e6fc SHA-1: 4c07c588cad9b1c4be76cd7b9ba0959211b4792c SHA-256: dcf497e867f897ae6a5686fa18fe17505cbf80f470137b70bf2abda785c5a38d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://pathtojanna.com/userfiles/files/doxemoganozukibasedivuti.pdf In PDF document text
    • https://woodfur.in/userfiles/file/70914162345.pdfIn PDF document text
    • http://client.diffuse.info/files/36186098297.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/18092926007.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sisunupawojufopat.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/fedobepebokamufatominopat.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8aa0ea6f2---vebiwowufa.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/gesupe.pdfIn PDF document text
    • http://mcutech.net/files/putikamijod.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109080622021902.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb81521b3---betawenataluloxepenixij.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/zuzubilatigerivo.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/59138532850.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/kukutovumapadawibisoded.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412393cb724---78485362646.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/44929333682.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/73078484199.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a1vq6t0ph53emkbs05tf6kp9df/bikuxilofudoxisogokuvum.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/jafopusozuken.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/kinebodog.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a61475c71---punedukaxazaxulal.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/624441c0c5b5533bc5febd77cee4753f/tatujemepigokare.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/lopoxabofasove.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/85000971920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+old+2018PDF 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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 17992 bytes
SHA-256: 6777b5bc524cf42f8479efe2f6582bd8584af4eebddf447b7d10eadbcc3d9f00
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 10508 bytes
SHA-256: 54433d75f389bc3f3d659619bfc5d7ffa63e36e526538b3eca5b794dec666d8f
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1