Malicious PDF — malware analysis report

Static analysis result for SHA-256 08afd05faf6eb8e9…

MALICIOUS

PDF

96.3 KB Created: 2021-09-05 04:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d61ff478491827fd1e78ec7d5cb0d57a SHA-1: 629b4d0ddb9bcc98177d591d127420d3dfa7ddbd SHA-256: 08afd05faf6eb8e9a06fb126c7c07ea8176437a7355ffe2a89ea2124c8ed6058
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier, indicating it is likely a phishing or malware distribution lure. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads suggests an attempt to redirect users to malicious content or download further payloads. The document body is obfuscated and contains no readable text, but the heuristics and URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=quran+pak+para+30+reading+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ssro0tr3uic5k18d0nh3ub5i77/wisunelofirug.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3cd044d3---44889067009.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0e2b92fd---morajevuk.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/wekef.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/subobikofanewujegudime.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba683322b07---fumebazitavu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8l3d1cff0phm69tsh2i92h866f/suwurusowe.pdfIn PDF document text
    • http://jarosi.hu/files/file/65385863245.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2a5ec6488---tolirofaziwavin.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bda46n5i3h9pl63d6tku1daf2f/71231597071.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3953932c6---74492521446.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/92907632352.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/87165365794.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/walusexojafiwomewujig.pdfIn PDF document text
    • http://blueyee.com/upload/file/251741523830.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108311526512075.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9492c3561---kagatulosizasolafupan.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/32049802035.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/93195353333.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8156d893c8760f02dcdcbf788ec03c49/guzagokowuresamuk.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15714e7ffd---gorexatopikuwivulisolo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c301e31f023---57383531822.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702535a149---36417351107.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/39346873706.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gubesefiniliwu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/motatuwijifujiwexepisozaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 23620 bytes
SHA-256: af8ed765006bbf4d9bf5bbb716b21487ed84f4993ce2286d0aded171d703d45d
font_01_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14494 10788 bytes
SHA-256: 6955def6c5f919f38b61f9968a50dec067eb283ea0eb451b43994eb44770d6b2
font_03_sfnt_off00015d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5F 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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