Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a8e220326b6cfb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 13:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3e71658f63bc926d0833f28b2145a85 SHA-1: ea79d58d8a93bdac12c6ac495a1a2464baa675ca SHA-256: 08a8e220326b6cfbbf6db4926cfc96a9f744950aa0982357b92a1ce66be07e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7ea80e2e5---kisewukeziw.pdf In PDF document text
    • https://tonitomov.com/picture/file/34471757497.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/kixupurotaxef.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c1394f473e6---27977846576.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/67425843055.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079931721156---kowipix.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/04fa87528d2ea13a62b4a78012ce6f2f/fofamaxavorasusisadijeja.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096c005eeae4---jofurajukaro.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/532a5953772833bee95b06b8d76bc650/safusomikunobizalise.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/9217509992.pdfIn PDF document text
    • https://protum.se/file/zanuzuzepexifanan.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/vexezekezag.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/52869094319.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/55417170152.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/zowif.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/nedavekifuvanokisi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210626_022021.pdfIn PDF document text
    • http://szjg.hu/images/file/lujamedimirel.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/witafudirotipenekosezipe.pdfIn PDF document text
    • https://samudra99.com/contents//files/16617068154.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ift1tss5vg73nl42bgf26pvaon/zekiritesiwonavos.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/92993592371.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/46857258227.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd00ce6fae---48592046784.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/53228065d7df17f6bd8f271baee32c58/63890764674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=first+course+in+abstract+algebra+fraleigh+pdfPDF 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_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 11116 bytes
SHA-256: 74ed33695d63cb8676cd31f294999dd8a22af410a9bef9c155502e11021c9c32
font_02_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 16700 bytes
SHA-256: b18696415693655be8f2915e4e57f2e380da58838d9f1b68a0428c3dc4cb8927

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