Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38927467242707b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 02:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c5620600d54694b465195b4cf3a1b4b SHA-1: df245de8c540cb42e63800ac5170d7850a84b27c SHA-256: d38927467242707b8e67bfa8d54a345ea96ab5316e6e69d17b921db42eed2600
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffee314d9---limowupaxapibezoze.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mo6g8ef3sc7kr8f8bt06jv9p22/bagemuvabasurenagumised.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/60bf8d188f7228dbc10f2348817ec2ba/zoxodazumakujitalata.pdfIn PDF document text
    • http://sergeybazarov.ru/file/jutuxilurutixem.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zisukunowaz.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/xonujowexerijeniwa.pdfIn PDF document text
    • http://kotolantopeni.cz/file/bataxe.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/994586313.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f2298d5a546---likefapuwuzomilagelasali.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fuvevixinajeg.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280610458395.pdfIn PDF document text
    • http://unseretochter.com/images/file/51799666095.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/87148851940.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/47622137839.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3bf3c96r0v7dus3nhi0r23bdhg/tijanulameradepelivowefag.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a054cfc895a---sasum.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ac6b91e8---bowebememigepekurote.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c7f5b98d717dbcc92c9b3e4d5603a37a/39458034262.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/56232328191.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e9e0f422---73199559887.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/22178783218.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/49729634841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sharpie+lettering+worksheetPDF 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_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 17416 bytes
SHA-256: b1404b7c23036f0c047a4084a8745020a8f423f694994417d991e28302506d62
font_02_sfnt_off00010e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 10784 bytes
SHA-256: 4a96affd8943f5d577a51b108b9ece070d344ccd967eb116f7e6ebf0f3ff7c93