Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cb87ed8a3266f4…

MALICIOUS

PDF

93.0 KB Created: 2021-07-09 19:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70329053107db1f633e892aa215e3743 SHA-1: da7bd34b3bf0b561e931b522c90ed74184e7c581 SHA-256: b7cb87ed8a3266f4aa6315825b0305eea949912eee0612243fe6bf4ae4a3df2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queure.ru/uplcv?utm_term=easyquizzy+movies+quiz+answers PDF link annotation
    • http://blackivy.pl/userfiles/file/26580242199.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/73637366183.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/86140631809.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4d4bd62fd---netiga.pdfIn PDF document text
    • http://fructusartis.com/i/File/73043495050.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160accaa4c473b---wekotibo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f16325cfff16ac06debfe4664b8c67d2/63143450408.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/44832517931.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/33426864948.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/rikulisewipenuditubo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8bc007af60c00f46983411f43b87261c/jatapasikatofogufavut.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607295bb8601f---romoxezosokobopoxabetewe.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/34069016542.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/3051273095.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ba281900---23257334319.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/tutaxegetofukewi.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/wolizepamamilovorinu.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210521191508.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/n4sujf5c9gueavs13f4num5u96/xuwuzobumibigokof.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/54949979744.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081465c2799f---28560209021.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8c5b3892---bawitubuvo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gamavagajedigekubiwitilo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c3f7d8dc6ccb94b8202900a3568911/64179808239.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a891715a4e8---62261877857.pdfIn PDF document text
    • 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_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10680 bytes
SHA-256: cebde6a315a1578d69b7d4b08eef8a3496eac2e5e99568bb38e2211092aff099
font_01_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 17860 bytes
SHA-256: 7b02190a9b09e5fe147435e66a85bba4319fda5fb7df1b705e72b582e816569f
font_02_sfnt_off00014ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1