Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9f4859a087c3a8…

MALICIOUS

PDF

88.3 KB Created: 2021-07-31 21:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9e597dd979cddb3d0bbc04c22a08ee64 SHA-1: 018685bb8b2b9d7a9fdd3aea3ac37605c6e4046e SHA-256: 2f9f4859a087c3a8ef8d9e9fea25782d2c57f116ff6acbef31b9f71425f2527c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external URI heuristics suggests it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.sudaff.com/pics/file/37626414021.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/32076687994.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d7e2b1619---zirure.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/petexutamozojib.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/mujiwepi.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/98478212229.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8f372914---25084482409.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/19631221104.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c3b47ec4---56499971911.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/51592438418.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dadd5e95b43f243b17fccd9837eebf4a/80523807272.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/69289806ba13180c4b569b15c78ef857/27291531368.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bitologilonujenireda.pdfIn PDF document text
    • http://goref.ru/files/file/35548479990.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb9950c9b---39364510385.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/87020898394.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xekuvimesisepi.pdfIn PDF document text
    • http://fruitvita.com/files/files/guvagative.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ace7fdfd---57933929475.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef385aa764---lelufozurunajipa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/37239403944.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/pezexoridejed.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/46e7d4a053688366a38b3333523ce47b/beweko.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b6feda59---nuvuj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c370b024c---18772856982.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/zofitolulefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cumulative+test+7a+answersPDF 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_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10484 bytes
SHA-256: a40220f0e8cf9347994f3dd4cd59d086bd00ec5cb4e651d35e43ded06f5b7e3b
font_01_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 17632 bytes
SHA-256: dbf6f323690899b8fff245d68f851023c3a38c3f0f10c10418864a9621d3c72e
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1