Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbfbc9a1e174a58…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 14:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b38416deedefe83c59f8bfa295ddab22 SHA-1: d073d9b22ba0feaa07118aec65cc20eb58ec11a9 SHA-256: 9dbfbc9a1e174a58c6725a20831c35fe4fc8a1baad70f2752b9c0c0800a5b356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f8090184c599fcf8ebfef801e1d80c54/52525796335.pdf In PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/59482229886.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/86066814258.pdfIn PDF document text
    • https://digireg.es/upload/28074208650.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/67243191857.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kurupowisijuk.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/93419181780.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/sizubufe.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/68288046447.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/pekuzof.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/14591103503.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161348e2257480---getasurojofajexupalugo.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/wetupiwujibusipuxomiraxep.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/jorukusedanasutewexoseb.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6drds1cessr1f47u1oofd4s8m3/dajamekijoraviboden.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xowosumemif.pdfIn PDF document text
    • http://timocomputer.cz/files/file/tifirig.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/48019862456.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/tipigoworuwapovuvenitekim.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/71950302671.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/39316367102.pdfIn PDF document text
    • http://scsychem.com/upload/files/zedetudijer.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/63643586931.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c447173a---pululafedosawewukomov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+pdf+reader+android+no+adsPDF 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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 18032 bytes
SHA-256: e35362f8eb02ad4c418eff411dd98d3b6108fe097c7ba24ad782fe54b8d8c93a
font_01_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 10324 bytes
SHA-256: f7038015e28d653821176b2e57cb3e3d546e5fe811443d2ae55f3b6049c9ce03
font_02_sfnt_off00013806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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