Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829af85988c8c89…

MALICIOUS

PDF

92.1 KB Created: 2021-09-10 16:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a219bffe0951a8a720b23f315420bdf SHA-1: 07008e0f2a26acb5b85d48c8b3b55fbe02458bc5 SHA-256: e829af85988c8c89388b7d2f42722124e6c584b9107bd33f8168f554261a8371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm and external URIs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically classifying it as phishing or a trojan. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to external sites, likely for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://garglob.ru/uplcv?utm_term=60+seconds+atomic+adventure+mod+apk PDF link annotation
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/rabafinesikomirebogulup.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tazin.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/falexikalotiwekeku.pdfIn PDF document text
    • http://vecsecity.info/editor_up/zisonuwowoba.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/foxukowunevepokezupofe.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/kevimowi.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/99396300136.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132842f5c239---vorirex.pdfIn PDF document text
    • https://estoniapools.com/contents/files/rirag.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109040604215902.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/19405027188.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/61834861293.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd0c8d7c8---wapabigetikilavakixedi.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109051925537291.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/27957459835.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/58744026338.pdfIn PDF document text
    • https://castel.ro/userfiles/file/90062785861.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/30966442807.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/87126089694.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/93348737052.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c157c0450d4579184c9f8b55b77f5899/95346770726.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vosolaxezilatanadizaji.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/tikeboranolitewitek.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 11080 bytes
SHA-256: 163186fd4500d982ef2665ce191abdae80587a755e7d45532e02933984250967
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 23592 bytes
SHA-256: 5bf43f5f306a1324138589a40d555ab3b561e1ef51d86cdf7eabadd805371263
font_03_sfnt_off000141f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000149eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EB 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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