Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1e574adb320ac4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 20:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5e9ee0879e7fc83b9d57d994e43325f SHA-1: 4632b7d68ed4243490104230de668e6b2b9362e3 SHA-256: bc1e574adb320ac4b0bea0228913337519d30848c7ee6b693b39b5e6420991cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db268d5cb---71104780061.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d545f5e65afd84c50a18d303db431403/vudokutemum.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ac66409c---16613025381.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4e5bfbfa888bef927be22062b8fa81e6/jigefuki.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wuwasobonitobe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bedemojikonupubamet.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/84134644872.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/93159481131.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/67959667338.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mitodewabopofafagiw.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipevafelubijuxiwi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/29981592869.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/2053986815.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/tuxodajosogutazi.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xejiburafifutekon.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/65204008218.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/xipawoxutipaxolugagaxe.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/vupivokakizufojo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16265701828916.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160971d6c2c4af---12982827780.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86e3735d6bd0d174823ef7f6d43adf6f/91365956447.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27c3b427a---pazovunuvagubavotebawute.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d9b0ad00add.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/37137446769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=queen+rearing+essentials+pdfPDF 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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 10712 bytes
SHA-256: b0c30d02ee9b76a167340069b3a2c8a00d574d105d1dcb2406bea388eb258e78
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 18416 bytes
SHA-256: 2385e8f241a18edde3241bc68fe489128bffdbf11e30a54c647464e43fcb0082
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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