Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e898825d393c423…

MALICIOUS

PDF

126.7 KB Created: 2021-07-15 10:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5630af09965642167f828b02756f6666 SHA-1: 9649999255144db67d84a869c91d72a767561476 SHA-256: 4e898825d393c42323187c698feb68960e4d972f3a3e096a730de97ec0ba2086
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, with a high risk score. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other domains. The presence of external URIs and the 'link farm' heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used in such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/cba6db97a5e243d98a5757e2c68e73ce/gebiwetururuxigimiwumuv.pdf In PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/1764718651.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/lumujidosupo.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/jimlvpnp5tbndl23ug044h85ru/bodafunosevidoliguzixum.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/turugobemamu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/pexedovofelumaxur.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b7feb46fbf1---43445501952.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210514182953_avig28.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j7ml3649sqp75uqve6ircq4sf6/vomub.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b9bd525e6cb2dbe309ce8f67e18d627/23752833002.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758bb995d13---55773355080.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/40edc12a801f927aefb41aecce673d6a/42011044392.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bbd38fe4---tobujezujo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zetumokefez.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16075b76f63dab---minudenor.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hn31o5c0fq0kursp2sufe82u25/1907147665.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/efe0416a4723f0d7eb2e5139be0c1edb/46435400910.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lovefolunulijuro.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mj76efm2dj9qhuaplmvfoja8cr/80971565039.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6ff46c96136ea0f583a3c2c43815366/64057160154.pdfIn PDF document text
    • https://telenovella-bg.com/files/18966172112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=faith+hill+santa+claus+is+coming+to+townPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1B 10608 bytes
SHA-256: f6bef11b24e0e10934ae39774e4a87fd73a2b95f542c8c9c619052246d9e0c07
font_01_sfnt_off00019537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19537 19676 bytes
SHA-256: 9bac7a7a48648c6e255c7d821ca1da35b89264ff460d15615840184616d680a6
font_02_sfnt_off0001c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD99 3916 bytes
SHA-256: c1524ef7505d0cd8b9d1c27653d0be12cb94fdee975a05b88bc854950f931a82

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