Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d857bd0b74cd0c8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 19:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4710395b6ae286f782757d531fae12d SHA-1: 1769ace5afca48600909e7d590c5ea1a954dddf5 SHA-256: 3d857bd0b74cd0c88d58e2fc977c8d3e3cfc3358052eb1fa374984488e909c11
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves tricking users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chinawin-consult.com/userfiles/42729190191.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/47493215754.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fepozawitebemukazodiwes.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cfc001ef7bc53bae6c08aee6d50cc92a/somug.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/punubegaxofeposevelaxuta.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4c8d46cf---54917939123.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e2bd3320---revus.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210629050455.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xowokazolakidefa.pdfIn PDF document text
    • https://bloomeng.com/uploads/mikar.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/ximalawunelobo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b598d4f80---rataxegufogizotewelaxobud.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/99572852756.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210818110057.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/dijotisikemutup.pdfIn PDF document text
    • http://allycatering.com/userfiles/52982038395.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0jv3ev8m68v79qh28a9a9lh4pf/tipupe.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32913dc918---fixekagotiripo.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/64194551342.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/37094254066.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8f98833d6bfa8add7d1e65bd445d2830/86324148284.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kuliraliluvavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=p+block+elements+class+12+notes+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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 16728 bytes
SHA-256: c79ab052cb371c078527982ec358f34659e014064d6a6cc17e7c723793a590ae
font_01_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 11080 bytes
SHA-256: 9103ea2939018662e3ecfd9f8d2b51596b3f063e7a466b2bbc1c7ecd18b8d94f
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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