Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3c3d1cc1a25a1c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 09:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cde8af044018188d75969e8069daef4f SHA-1: 6f29afa344945cc7840305ac65de97baeb58726a SHA-256: 2a3c3d1cc1a25a1c93f88a68aeba3bccb15b9663e72c9e2509e50d25b4df900b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/7162320722.pdf In PDF document text
    • http://polesprogettazioni.com/userfiles/files/29053125102.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71c8eec71---wakupenefur.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/47585144496.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3nbdmg774jrk3j9omb1kct1h95/wivujedofen.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cu20djlhaulclrtju8rj1o77ms/labom.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/44322109417.pdfIn PDF document text
    • http://ailizia.com/userfiles/jajapazukudu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/14344962982.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/32413274383.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e819e19e---kalotexuvarijixej.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084934b614a1---xusijepesa.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/gakaxinu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8167dda7be---84738562646.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kivazaloburemaxarure.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wasoxuvobojaketiwog.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e4acc9095---12090313291.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7b098c9c9---fomamovefijeronasutasik.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/jogivifizekexidete.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a65802eb7bef72d5a41c33357c7a8fd6/saregi.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/kofidakavarojadopexitomom.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4beab7a426---44702504902.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/88330541257.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/vanaruweranozuxabesomom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ryobi+one+nail+gun+manualPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/66697098306.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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 10484 bytes
SHA-256: a782be2db459fa54abe09093546974fbdc36f8591152e1650fe99ccf0d4fbe41
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16808 bytes
SHA-256: b959fa364b9946d5cc84d3427a73bd053bd8589ca69710db6ea05c608e091440
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1