Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f00b1bf1cd2e738…

MALICIOUS

PDF

104.8 KB Created: 2021-06-27 13:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5169d0236f81c58eae7d7d86ff54d118 SHA-1: 0de8b3a1b598fe35d65e76fcd8b03d9ccce045dd SHA-256: 6f00b1bf1cd2e73832d53009adf0fd5f6ad61ace0ace4712a54afd161700ff48
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to compromised WordPress upload directories and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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 https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a26b95b7983c16762f97e2cbafdc4783/22198762322.pdf In PDF document text
    • https://soudurelausiere.ca/upload/editor/file/bosadadefusovuzuje.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xexamalunojiru.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2379d7ffaa---37355862328.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4918369b---guvizogisolunewi.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/86959411194.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5aa4caf0---39499216830.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acf01ef9b---jegekekojewa.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c892761b0fe---zurezem.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ccueidv51f41b41cordt2gmn94/zivilimixuzafu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ce73bca0858eded541356eeb05a5f1fb/dasurawevaweromomifi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a18a16b3---duxemoten.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce908b70dc5c79773a42a650dddd44e3/14131988944.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc63d4fdb5---toxibubisifedogoxugejo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d38657662ca3c5cf3bb84f64836876fc/zevutakuzafuzusew.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/387ddd00e2b98121c119045f1523bc0a/2972100168.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e10bf0cc93---majusejuxivip.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8f80319042fb7bf7a60c49ef53ffc4b3/xatasupanizemifujo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62d6d22ea---92046401336.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4843a11ac2---rojiripejesudutodesafu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/70839057663.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da7fa0dd3---87355514344.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607465bf76dc8---5277233113.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/joxegivezanewajusi.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/zamimixape.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6213c7fea2ef2d450414afdf7185daa/sedegamenak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=last+day+on+earth+mod+apk+unlimited+everythingPDF 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
stream_004_off000131d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x131D5 31260 bytes
SHA-256: 17b762a1c3675caa0740e45ab7596136a237ca97d4f3fd95441e058e73cdab59
font_00_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 11168 bytes
SHA-256: 128ec8cd1ec7346ec9f5d392b3b2dca7d107888328463df9f2e2d6f76ac293ac
font_03_sfnt_off00016870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16870 16968 bytes
SHA-256: 7a1a1d99079dc6745f44649b96089f3deae22ac103be7c572d2aa24ed18bc6f8

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