Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4966852adc51807…

MALICIOUS

PDF

77.5 KB Created: 2021-10-05 14:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c0f0bb525c89e860a25447a117953b6f SHA-1: 42483c41c363d477bfe3a9d58888baf3fe4866e1 SHA-256: d4966852adc5180764b7ce1f5a3bef9f5d15632321ea190fa10b8b8d2f9a1537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, including WordPress upload directories, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7ba2667c24b41ad65565bcb2d222ce16/kupotafufigesesizegidef.pdf In PDF document text
    • http://lavalnerina.com/userfiles/file/fizomew.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/956951091.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/5562479867.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210926_203032.pdfIn PDF document text
    • https://hirurgija.me/files/60461223479.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/89c8780a65c97da00caa21ac33771ce6/dokilafa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436abb0a492---59642598490.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/38677494604.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/85537667434.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/54468863852.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/62245830183.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/tubexoze.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/74358002843.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/eadd5f1b0457b421721893d5a08ce224/savojuwenize.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/22627484447.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615904c54e339---mifonigigovupazudijixes.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/85796113651.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/zumopegutumigamide.pdfIn PDF document text
    • https://mangallagn.com/images/file/1695740523.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/25021237271.pdfIn PDF document text
    • http://bamila.vn/luutru/files/78360775432.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/75769032228.pdfIn PDF document text
    • http://pasaru.com/upload/files/dotojumavenatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=it+goals+and+objectivesPDF 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_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 17116 bytes
SHA-256: 907aca60a1329d32441572621cf3dc34432ac744ad56a5d28e4e778d8f1d5361
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10732 bytes
SHA-256: fa32790612f960163f506f24f5ff142cf8f5322a8169e241329b7f23ef52c0cc
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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