Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1ecb6b491b58b8…

MALICIOUS

PDF

93.0 KB Created: 2021-06-27 01:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fa72458e454173d21319812789613e1b SHA-1: 2367489035da8c14159f2e4ba1d71ad64609fff2 SHA-256: 4e1ecb6b491b58b8c00a25bb0f25e4f3981cf696350d0336997560d102f805d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://anaminfo.com/attachfile/file/15123574635.pdf In PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xiwavuxijuzipugedovu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b6bc264ba---27988955666.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/gubukebanusasowuj.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/zasewifesopu.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/9978235215.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/jugulonokaf.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd573a10e04---reberixiwididave.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/92644104390.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/10380c0aceb08153dfc50341ea7c11ef/43746123195.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6750d80d---xofubojafalo.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/62318237316.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876e73f2ef0---83488013408.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5438059cb1---87411046132.pdfIn PDF document text
    • http://toonesk.com/upload/fujuvagoxupibemekugowel.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10c676e50---6380761913.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/diviwutegixijeki.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0597a19521---bodimip.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/waribenixubugezupemu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lujimuke.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc6948c68---51511667563.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b3025eadc60a83d296dcee8543be3384/76772408763.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c784bed8e14---28124433973.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c5731a4af96478ab75a323db7c8d1e5/39684999390.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/63644756762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=crazy+rich+asian+full+movie+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_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 11100 bytes
SHA-256: f805b936e46b1899ea25dfc2a62a7809096d9856d52231eddc27c0f03c3605ac
font_01_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 17168 bytes
SHA-256: 02fbe898522d29e1ec1978febe41c58bb61ddcd1907c42175531d2909d28b757
font_02_sfnt_off00014e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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