Malicious PDF — malware analysis report

Static analysis result for SHA-256 279c40e2519fb8b3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 13:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8afff2ec9a85e54e7300c83c30665f8 SHA-1: b57ab0c14b50d31bd41d1fd2996ff227e46ea484 SHA-256: 279c40e2519fb8b38b61a0487467abe9fea3ce13db39ba62ad1afd91b2d9dd55
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=cara+menulis+daftar+pustaka+yang+bersumber+dari+pdf PDF link annotation
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c70c8ade760---nowomibosi.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/wufufejilajipomufovan.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dbfc7305b---56345554673.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/zoloviwukabep.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/sizux.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/sazudurewupimav.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/34282177351.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7vv12sd6dtmjqqu7v5roitoqr0/pilararitevokow.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kibukuzoki.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/43343487398.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/61789983371.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63e3589b0---96985729362.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/tapewam.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/17359628624.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad1e8373---melonorulag.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d35f8271c18---10162647263.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/botipin.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/livopodo.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/19323540341.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/julum.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/kezemafipavavo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/livuwo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/6macfv6rgmesf237gtumauirm1/35825571549.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/21641901218.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7dfddc23302777b52e12c0dc1f270c0d/suroduwa.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/voruke.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16992 bytes
SHA-256: 211fe945b5e98ab6364a1767c6339264aeb0870eb983bcf8e160ce9ab59ed6d8
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 11200 bytes
SHA-256: ad5fb83c26b6074682dd3565b9f74dc58ee443ff4372f381135c449c33af2449

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