Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a7f3861eafc149…

MALICIOUS

PDF

100.5 KB Created: 2021-08-13 17:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e39b589ceec37404d967acccf9fafb5 SHA-1: ff506ff0c6b21ba2a75c2bb38b644c32cbccb5a2 SHA-256: a8a7f3861eafc149a6b9bbbcd63932bd0f0318f2c62ecb25c90b53a8a8fe5098
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://autoscuolecasetta.it/userfiles/files/duwuduxes.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a025fdb6---1909353313.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/22205174784.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe30891b7---76047043399.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/wutijesitazaxidefanu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/80599724055.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/liriwojibutitemenixodox.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a361d6e8a3a---lafijazaferopanugi.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210702_CBC76E7C377F5A3F.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d6853e61---22530934589.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/698ade0de798ca0b0f65e2f614ff8f7c/86752791361.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26b481f45---76699353997.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/68501819715.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96ca81b85---39385593822.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec018cdc0f---digun.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lujatagelevi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/600238792.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/sewiletibajezorezub.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/626a0e38f493c31cc8a20ccda077735e/guluxafatodiwixu.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/binobofekozixasesomux.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/11086428589.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/52e147ae1505b148221ac438ce7a9d4a/45397017544.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3d044b64---42862292889.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/lazalolagariso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shiva+tandava+stotram+powerful+mantra+with+lyricsPDF 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_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 20112 bytes
SHA-256: bffd49e770642e4e10bac44adcedb3e5492a4da0060d5c793ff1ac5b820b5c1d
font_01_sfnt_off00015149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15149 11328 bytes
SHA-256: a514b922045633bf6deaddf5fa878708662c3f033a342af8766f3f78f7776d9a
font_02_sfnt_off00016bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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