Malicious PDF — malware analysis report

Static analysis result for SHA-256 c097d0fb5fd69adf…

MALICIOUS

PDF

105.6 KB Created: 2021-08-09 01:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea62cde6be9c812bbcce4fea5ba70534 SHA-1: e37deb2907151813fcf82d35e6f6aefd06669e60 SHA-256: c097d0fb5fd69adf399d8fe4e30565a54b7fa0c141d89ca6bffe31e9d1a453e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or scam campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

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 http://jinohair.com/upload/files/fifidakemasiw.pdf In PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/pidavuvesonunutoris.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160beb38b0a593---wenejujidewaxitipor.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/91964569978.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/fulitarexivebezususameb.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2b6687448---15112409535.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745617b7a29---42550739734.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c655895a80---jebibagobuzozotowilukab.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958c63b3d5a---2802535005.pdfIn PDF document text
    • http://apcmagon.com/userfiles/kovurowow.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qevepnfjpmk59clqt4fj8tnd26/31553810239.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd072eac39---7730457823.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/doluzulopelipofamad.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/ninikomemuz.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/78957488842.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/42747240227.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9a08053---likofovo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b3058cc20774ab7e74f959ef7d41f766/welozopufurazozetane.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160890a91030c0---niwezixaliganogesis.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c41986ab314---19993811468.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/90f5f36c63423eb90e88fc9e47c85660/nigepexaxulasar.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/67231100379.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6c9996a3a3dec4cf773452ab61792654/kazexo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d94f9a3035e143b85f06b661d04403ee/jekurupizopanome.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/26417249407.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db3df1efe87---wefufilejatexukaxibok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+2+google+drive+mp4+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb
font_01_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 19076 bytes
SHA-256: ec253458cd30feb09bb9cd740ccda48b4f02a9b5fbf577dcf09a5fb8e1920945
font_02_sfnt_off00014dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDA 16280 bytes
SHA-256: d7cd55395ca8c5b3ded2e9f44cdcfdf374181edfe397b2f4d7fa01d4c9eac515
font_03_sfnt_off000163fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FC 11208 bytes
SHA-256: e26a9a83e04279ff53a6d0294cb1e1daf290cfaf2cd668d8008d7265aa09c8b3
font_04_sfnt_off00017de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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