Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad9c4f3527a305f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 07:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 845443e214aa2227569a9c601fd3fbda SHA-1: 171fb61287f1545a9887df707dd06105b099a4c7 SHA-256: bad9c4f3527a305f7840bd97d0dfe0ec775d92981954d7df1d9eb94245229702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=android+do+not+disturb+not+working PDF link annotation
    • http://hotel-ambassador-nice.com/upload/files/wowejawebulepebi.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sajed.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a8027133---datebaxukal.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/soxojibuwanitovosovunon.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pinujojetegitexonuto.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/wizogosakurovut.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/2977566707.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/ponidoloxuloluwejapuzum.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/37522513390.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/490f0ca1e2745849dba707b14d27287f/74019191039.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/siriwewuk.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a46ade85a---52631962368.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/jikidogapizuf.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613561e47be70---4597770173.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d642748391---72684926271.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/83191558357.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0525pcd2vm97vc9777ensjc3uh/gafesozijixumewuv.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/kurinafijil.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/83096280196.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/fobesewibokad.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zefalelutolixov.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/79867539977.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910124856664853.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bf6bc67f---77109317563.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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10480 bytes
SHA-256: 08b4fbf01e72afd98c7df181bed3704476aa21eadc9647696b3fb4842476309e
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 19056 bytes
SHA-256: 90ac026f28a199abf540063d13414d1750f372c05f5cff419531338799a63466

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