Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d02c9ab6fd6672…

MALICIOUS

PDF

103.5 KB Created: 2021-09-11 16:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a989e3fa41dfc416088f62c613151a8 SHA-1: 26a1c31ff69456f27b08f259a2fa41a7a4187ed8 SHA-256: a1d02c9ab6fd66724ca487b887d1492404410a823912faecf7fbd2cfba5b90fb
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. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. No scripts were extracted, but the document structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 http://khaskhaan.mn/uploads/userfiles/files/71074324949.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fac6c38c0---18697102371.pdfIn PDF document text
    • https://eventaipei.com/upload/files/30662239815.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/nolujifuropitigonusaw.pdfIn PDF document text
    • https://lesura.net/userfiles/file/kitexovazune.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vimomebotogiwisanebulopo.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210907_223837.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/g8ob570sg76gvd6dtm443qcr7a/35946186253.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/dasuvimu.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/meguka.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf35da55---kififoxobemub.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/lewex.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/boxopaxutuzuwarogixadikun.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/65564475519.pdfIn PDF document text
    • https://gdaniec.com/upload/files/82695746102.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210905_0E4F2A5CF7A5439D.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8c0gqmlgr2ted9hglfrimeoh31/55045548094.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/kesidupurusawesokuvor.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rukupe.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/22421155676.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/fifomufefokejiniju.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/19203693180.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8a9b978ee---53631244877.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/9938413625.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c27f875c8---47163421960.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vazafufubisonasujiroveg.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/23064687209.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/61591476564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+activity+transition+animation+libraryPDF 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_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 17860 bytes
SHA-256: 302f697618f80e28a6ee4088ecdc3a2e952d178538b8ab72f3f3be8029eebdb7
font_01_sfnt_off0001438e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438E 17756 bytes
SHA-256: 575ea01e637fee9be7a7f1574878cd29e94f2b640be819b8c7bd6da08100b0d0
font_02_sfnt_off00015ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000176bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BB 10700 bytes
SHA-256: b2a59c4142fc2f219cf34bccb036c1e42c45854ba08e288387da04d8313adc59

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