Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d510e1964de9db…

MALICIOUS

PDF

90.6 KB Created: 2021-09-18 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 863bddf016c55a8782ab2bc75184d1a9 SHA-1: 11b8019a135b72493b74aca3d1d0b118b28445af SHA-256: 38d510e1964de9dbcbcfb7bdd1198921a466347cd64b36866292ef1a3d205f43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://foodvellythailand.com/upload/files/misaviwe.pdf In PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210911_8CF200A4DABAA68B.pdfIn PDF document text
    • http://ranch.pl/files/file/91268998082.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kiziwetiwuwupowemodumu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wojibodojedapotu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/11737504914.pdfIn PDF document text
    • http://holzweiss.at/99130155173.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210913131914.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/17995887574.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/durerobojabemasu.pdfIn PDF document text
    • http://royalgroup.at/tmp/31718346157.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/28545492774.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1bcd6e013b7b754e0889bf7e65e6c082/63351158538.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/58863305756.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372d24cdfef---felubakojusilo.pdfIn PDF document text
    • https://quizai.com/uploads/files/fokuxa.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/48136520696.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba408e28---lavagemoforipudajunaparu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/72039995536.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/wedax.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/govakogoxemidudobanomixi.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/jadidakapovizoxujox.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613446500bd38---52459051330.pdfIn PDF document text
    • http://sartor.ru/upload/files/sefosulijugo.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/61839963910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=androids+in+blade+runnerPDF 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_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 18428 bytes
SHA-256: d2dd2941c99859abdcae30b2959d9367d74ea0939729e721c3fa14498860203a
font_02_sfnt_off0001454b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454B 10364 bytes
SHA-256: 4e54bd236bdc43b1cd69ecfb7f586383a07b50f6f402fb58babfd7feda736fde

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