Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41130019f76f813…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 20:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7cb63f9c076b6c424a33f9a5d4adcbe6 SHA-1: 589c9e255887a977c1934eadaab2e327dcf2e924 SHA-256: d41130019f76f8130467850e3c38463a37e3f7a5f0a0285f856d86608f65bbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and numerous external links are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=outstanding+debt+meaning PDF link annotation
    • http://ximangsongthao.com/app/webroot/uploads/files/vidokamu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nifewasojebipageki.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/zowubopewogufoki.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/4692384322.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77980039141.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/45b6f72cc02e5528d6f2c60190eab059/38831531636.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7eacade51---52595384351.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69476d837---zulovifusegorewewipuzopi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe7117b9a0---nirawixubud.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b107480d8c0b3ea91a7fb9d752f86aba/melubikegasak.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c1li2a7gho72vqogf6khvn5k5u/77558046581.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a247da84ab7fcd8b3f4dd1745912b9b0/29123923112.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/litefefapejawumop.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a9b21782---dejaponu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8766df707b2f2db73ff88fc5557729eb/salelarawiwurukum.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/41913235383.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fdc1cdc31---musoxoxatagunamubunajug.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2himo83ikctoaiqghu5pi05jf6/fanumisivagutip.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/rixinepebewemoduj.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/68764587449.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/93687500975.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/53098359177.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-20/20210620161558678653.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/badivef.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 16624 bytes
SHA-256: 760f8df2786da593f553c5e1bde0f931ac94ca7baf74d31d86e1a278bdb4de54
font_02_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 10592 bytes
SHA-256: 1e875daceaf6c565679d0488239e7ae2a268a99b396cb78bf043575b86676f45

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