Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c4f288ff7d76d6…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 09:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 63a06b24bf198ab532a19c048fe63508 SHA-1: 7720d13e2fce4f2469bc4e0d75d6449cd088c792 SHA-256: 25c4f288ff7d76d6cb1c3d2bd6bc5a663003caf6775919298533e55bab1c6a81
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and SEO-focused disposable link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crewmak.ru/uplcv?utm_term=zojirushi+rice+cooker+manual+ns-wpc10 PDF link annotation
    • https://acrgroup.nl/userfiles/file/zojokafozozakonixef.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a1r238vlrc7nard5f87vnhdva2/12373052795.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da63e9424a---tezuj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d67b3834---tezimamalokinozabud.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/59947028350.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/vaserilexoburazelexaj.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/16nt3k1j9pb8ctappic31k7skg/kojekovasafokuwero.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/88622754242.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/wevubolubigoje.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/gfunorvh4jtucb0ejc5ickg02f/sexubexizinu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uol6mi1sof7ersiianccj511pk/46621002450.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b1a35b16---namedunomukuxi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/gubemutudurizufexovevosa.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nekenulu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mobolitejanupusi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/u2bidgnvi6rasse013em28drm7/jezazowe.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/netutaxuwojago.pdfIn PDF document text
    • http://gptools.net/userfiles/file/foxunakab.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/moxenabagixek.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59cc0d3f47---61057913431.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5d12a6d7---76307701895.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/83413040351.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/jipamozolekeposotisib.pdfIn PDF document text
    • https://senfina.top/uploads/files/xidupogabilaralo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf0fbff4c---rolukulumuxekonixaliv.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tua4jmtgt5u1ag7p5r2radevqk/15267857777.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_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 11120 bytes
SHA-256: 50fb8c6f05b4a152912f4fd7fa55ff1e5e6d7f569ff98e256f3b9935e6373aac
font_01_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 17032 bytes
SHA-256: 5eaaf09ab9687b0786f609dee16c9eccd152af6ab5a21dc171ef7bc24d1c3c8f
font_02_sfnt_off00014224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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