Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de72edbd7f3974c…

MALICIOUS

PDF

97.8 KB Created: 2021-07-26 09:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d2506920b504b97deb44f08b2353777 SHA-1: cd990da268b2ae28784989bf1cc09234cc5656f2 SHA-256: 3de72edbd7f3974ca5f36ddc7dbf090d38be69b35b7712f501b7cc9a4ceb5754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://szguilong.com/userfiles/files/junilamozabarula.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///66392089944.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210709081453.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zivate.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d4386d48---gupapareramomajewovejo.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/15224865021.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/93836037148.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/povupawujixazuxiz.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/60047de1e6a6f6d8623d8f70c089c316/mixejoluwujor.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/80305105155.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xokujugoj.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mj0d2386ea6p5o924tl55f8iuo/vukitiduwobulonoxu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/73ebe69638cc003c6b8d59902c85399a/lixuw.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cr6t0sev1injsi8ek7ekmvklh6/xadebujedilizewagenoje.pdfIn PDF document text
    • https://penal-garazh.ru/files/45600923499.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f761610580d392dc6ebff8bca733868a/bupevubi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mukebakinude.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/87qv33hermfq30eq7c3inbp629/93711079341.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/poluvibitowa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081acfa395b8---7718094443.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/456d2d7ce3348223cf0a1ff7b426a111/45000132777.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/tefujuwipodojawomosisav.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/waxejaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shri+aditya+hridaya+stotra+in+sanskrit+pdf+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 18568 bytes
SHA-256: c208e203a27030e7b1b41322c5b0b042a3caf55aa26cc80aed3864ce205937d8
font_01_sfnt_off000146e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF9 10960 bytes
SHA-256: 2968fa0818d64b5641d6b49b1fa3a6c1cbddfda98b0e42aa64245c0082d920f6

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