Malicious PDF — malware analysis report

Static analysis result for SHA-256 766b64de3958f4bf…

MALICIOUS

PDF

91.6 KB Created: 2021-07-25 20:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5d2576da65f0cefdee928a69a2aba3b SHA-1: 12528777d28232ef82001c23f890d3bab6d5c1f3 SHA-256: 766b64de3958f4bfb7a0c717c16ad0a0278d20753cdea132f289136dffb2cf01
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or to distribute further malware. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true destination and leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093670ad5e08---55776112779.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537402da60---10867773116.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/1452062015.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/77725701225.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/91894f025d2f9b40d64d7d9a4bca8aad/galupixolul.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gajopewak.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/lugesewapafugujo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d30c3045f---buwexesoridurazilipanid.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6b1e2d7407e671393120505a42e5cb71/wotowudo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/33550581440.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/41007813729.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/94669336077.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/24817050994.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/35552122011.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/aef34e3cd962c1a4f0f8d9b5d0c2fd18/71260672665.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160822ea24372a---3077707711.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/28800994918.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5ktqfd1n8u32h07dpqhkrnsgvb/zitozu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ede12cc7---pukogesiwezaze.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce8d2f5fc---getiwobepatefipisuvir.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1419c88ced5f799fcdc545162889ad64/60283001102.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/25dd791b8a32d6f038493bba405e5b05/47331576263.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/kojafalazofavukodifewarig.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/woxejijujowi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609112770dd8b---17789553799.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/61622593445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=inervacion+del+musculo+dilatador+de+la+narizPDF 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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 10708 bytes
SHA-256: f54817951e6938af639ce52881f67c4dcd66bdb323fa74429604ba9d8070821f
font_01_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 19660 bytes
SHA-256: c6383d022a0a3c6f791f891f3b52b93f0187a96f92f4c558f0c260cbcea980e5
font_02_sfnt_off0001450a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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