Malicious PDF — malware analysis report

Static analysis result for SHA-256 8064489b33c738a5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 11:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c31fbbce1559a62b1a3d7e2227d5e6f4 SHA-1: 688b08860c4f8be5fe2a6f4583a3b6433d1a9cc7 SHA-256: 8064489b33c738a53d2e86c835b46c55deaf6ca0e6d77c04eb067a4a5a8312a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads. The primary attack pattern involves luring users to click these links, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://dpengineerindia.com/admin/userfiles/file/fewumapoju.pdf In PDF document text
    • http://anvlaw.com/userfiles/file/mijevevadafewas.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/92403000210.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/48516953480.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b15ed18d---75580585463.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5d0237eb---50267320234.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/33809824695.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ridepar.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/77170872312.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/75353695747.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/90c011d3ff4e6d74ce76fae3ce5c7cb6/rozulisimepigageji.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/42767328867.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/53924616103.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sakuk.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/58136064886.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/9573472840.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5q5urjabkvsu5qjkpqiht9l7g7/13884379795.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/mirorululiboremelemabiwed.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ee9b12dc---54393231193.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/26124fd6eeab4f1609b24b9b733c8e55/7717807201.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/h7jn4gojr5r90vu8cejvsrg5p8/foruso.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7687881d31cebd605e576cca05adceb8/85896146821.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/38126010086.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/zaxubizifuwufoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=unity+user+manual+pdf+downloadPDF 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_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 10964 bytes
SHA-256: 2b45b408a329ead3e39283d3bd5839965db44d91c47026aabf4783bf8987290a
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 18692 bytes
SHA-256: 448bba77eafddb3c5922db9a98fec39324e41d01767733fe53284f3fda58dfbc