Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dbb98430bcbc95…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 20:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28d8bd509aa59d260ae0e249b836a09b SHA-1: 8a109055606d66e68257d29534dca496c2df1cf0 SHA-256: d5dbb98430bcbc95671e2e0246da941e7de0a9adb833b932403265d3bcfdf311
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to host and distribute malicious files. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc12c82e---xopifevujefiziga.pdf In PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsgsg3jivhi8nnoqibo943ln9t/virasabuxikafopaselujogir.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/89679649031.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/batuxabatizajub.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vakaxutimi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568922464a---lekogupuk.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/lufadepaban.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/bijim.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8f9e2e1f---sezok.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/128b38676ad1119738431755e21f9f66/tasebuvefivoxopoman.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wifufesezetamodi.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/teloputakiwuforavitakoxu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/53642739137.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/regodizipagegupa.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/54299703493.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeeb55d868---24525056177.pdfIn PDF document text
    • http://yepuco.com/uploads/files/40943949456.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3926defe1952b83aedbb35b1b96edca8.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/96195761890.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h8pdvif0fkn4l8vmt0uttsonc2/23126101422.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2999e84ba5914f7cacfb594b30769850/poratav.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dnh62ohdhdu3rffrc5jdmt0lc1/pejegesegokip.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/mejupukimuwotujaman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=english+guide+class+10+pdf+downloadPDF 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 17364 bytes
SHA-256: a85afa99fc9d107c177b9be8be25ed8f1b40d7d2c7005d8d0a291cfabff55a09
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 11044 bytes
SHA-256: d6320badbf3060b39ff6daa7ff0fc2b3576ea2a25764eee5302c4aa8146daad5

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