Malicious PDF — malware analysis report

Static analysis result for SHA-256 369296c90a2115f4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 21:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57c0416b098c29591627a4fc002d40d2 SHA-1: 95746b2c24991ba7527b3ac1214401ad0258d06c SHA-256: 369296c90a2115f4d17162bd6fd0a613900aa2e6b3b1ffa7a6b4ce5f42987ee7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple external links, including those on compromised CMS uploads, suggests an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.odnpoznan.pl/fotki/file/file/risezozimezasi.pdf In PDF document text
    • http://www.scsk12.org/policy/files/files/diwewafabo.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/51150866911.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/56631070408.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/72504072061.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e668a2905ee---jutanosulapedab.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/23644953371.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccfec4c03---sesowakejig.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/pozel.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/memagilebifijokazakoxa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5207387e6b508a54002e357989a3bb33/beluxa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fc638b1d---94099679494.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/62d4e44ba7c3a426affe5192479f7de1/38623747390.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/27337026985.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/74170958483.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/turer.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zomajisaxusej.pdfIn PDF document text
    • http://marymo.ru/uploads/files/dabobovosalitarujobuma.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/32992662556.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95a7759d4---dezuvalagonopupezofore.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d6f4b03e2---xuvizevogesupojavo.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/49346119656.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fcmmi1vo7699qiec6ighve9idq/gelexudi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160766d83819b1---jiburixiwuboror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gleichungen+aufl%C3%B6sen+aufgaben+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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 20796 bytes
SHA-256: a51e3a40ae80f1cbc2dc37814b519aa199f4be45fe7143b1ce293d229278cec8
font_01_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 11076 bytes
SHA-256: 7382f4cc02d5aadd4246e0ebfe49df980fdca495d045d218ae8d0ac16461c354
font_02_sfnt_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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