Malicious PDF — malware analysis report

Static analysis result for SHA-256 167f6067043662fe…

MALICIOUS

PDF

85.1 KB Created: 2021-08-23 21:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a03276f6ff3b44f80d43ec982dd5d335 SHA-1: 68f56722254263f96fe839fa96c8b4534e8ff53b SHA-256: 167f6067043662fe6d59aee02f654890f972748749c0e710b7f26b25c4f93aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://lyna-garage.com/htdocs/cljr/data/files/ranezeguwo.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6afe32a06---41754132293.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/13208491251.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wetaradoditikugozo.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/81483991422.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/52978781311.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d83377786fb3d41f65eaaf399fd012a8/32771989503.pdfIn PDF document text
    • https://music-group-store.com/upload/files/38807298381.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef51fbcd0e---37974899414.pdfIn PDF document text
    • https://apizf.org/public/file/dafebaroba.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/15942565211.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/34211759130.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/71608883879.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/80012992829.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440e1b24fd---63388975893.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/57943742406.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/fuvoxufop.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/79638824514.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/59255110771.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/28575101254.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/nuxelixagolugixet.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/12084773005.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/1744117271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=betrayed+meaning+in+malayalamPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 1744 bytes
SHA-256: 1a224893f7b2959347d0c4232a6442cd97fd406785258da330a2ae19633a62c4
font_01_sfnt_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 17596 bytes
SHA-256: 5db41bfb2409678faf4887824dc59827af5eb50ae8cc1a263622e155b568807f
font_02_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10472 bytes
SHA-256: 781cd326435d320c5fa44baaeb1e6409a9bbb9fe4333b0d212c98439c3ccf09e
font_03_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 16524 bytes
SHA-256: 3cdf4f8f4dce7a464fe4e8ceb6988aa5bf7bbea20165803f235b519784394ddd
font_04_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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