Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba0a615c6f8f9a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 02:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6727000ea36b9387b1fff9759615e65 SHA-1: 1107ef48800023da052dd5843cbc1727ab71cde5 SHA-256: a4ba0a615c6f8f9ae690cb17b65d22dd9ed243f0cac54dbac49b3ae8f984e8d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=free+iptv+apk+for+android+tv+box PDF link annotation
    • https://semagro-msw.ru/pics/images/file/46992174312.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/kizaroladebifojaxajabapun.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324ea681a28---pomukezonimaripawid.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sb82n2qh6q3ld8famfc5kjmg5u/1541732047.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210904191126.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/30237430718.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/89666889181.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/60161077571.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/64935693574.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/jatofomi.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/lurotogurafuwad.pdfIn PDF document text
    • http://www.andreapondika.cz/file/70941105190.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/wawiluvuruzez.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/vefijafuwuti.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/48148551241.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/31982374064.pdfIn PDF document text
    • https://vpmemorial.net/images/file/4078432758.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/58072644629.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1119336304.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nijawepubepan.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/linaz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f88a3d5---diwoj.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/93591529253.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/55227134800.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/64782208040.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 10652 bytes
SHA-256: 6a6ba72352fc2082bd9115db62482b9a81bb0e18f5416afbaa61836b0dd04491
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 17272 bytes
SHA-256: 8757b3878cddd6de627e177ab81dc3270d24a71973c54c72d940e878e2122074
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1