Malicious PDF — malware analysis report

Static analysis result for SHA-256 d278f6142183ad55…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 17:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aef122abbe5efd0c608c24ac7468a1f SHA-1: ffa8e4eecb0a7bf10e3e1b43694d6a444ce48bc5 SHA-256: d278f6142183ad55dbf4eb206a1559cbdc8896444824c60152f0530e8b4c6ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://archism.ru/uplcv?utm_term=el+eneagrama+de+la+sociedad+pdf PDF link annotation
    • http://www.iciparis.ru/ckfinder/userfiles/files/lenupoxukofaxirebud.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/fomenavexovopasukiwisa.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/fibonuxizev.pdfIn PDF document text
    • https://best-label.com/upload/files/12188672517.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4e7da71205aa002afbae0bbc8c1c7299/36094224609.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/55395181382.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/484412f6d6b8a2e330ae8ba2bfbdead0/lidofesatelabusapodelin.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902123844.pdfIn PDF document text
    • http://boldogelet.hu/media/43459088484.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gemepugaguwojanobukuweget.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mofuwulelasipev.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xubijexiwev.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/dagun.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96549112711.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luxasazubefaletinin.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/forabasarivefur.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136482de7a4c---funivez.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/badulorobanadi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gegefikufixarutomabas.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/meveturasemi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/86256388944.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5021f4b3---11010195725.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/81645841349.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jebomevisifivapovesogatu.pdfIn PDF document text
    • 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_off0000c318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 10848 bytes
SHA-256: bbd8e7e01b0a5a3e8f9bf198bd075336154661d065acf04001f764c0935065b5
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 19516 bytes
SHA-256: a79b3929d0f6203224785d9e8181cfee2a00be449c36f987a8b32c1f2c6bba9b
font_02_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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