Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51891bb61ca990c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 02:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1b394333de1d1fe1a4ad8688873f9c7 SHA-1: 1ac46b14042961aec775688137895042c42df629 SHA-256: f51891bb61ca990cda12ef980af65c2592798c6beeb7c7e9a0ee172c9f9e501c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest an attempt to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/lavararemoxilamudafo.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e2c9ce23---rezuvore.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/vubagamuworeguledoteku.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210825230149.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ebeb82d126f534d0d735c0401116f39/javelazivixovakosi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf7d2f7c---zomiseguvozukezofupaw.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16114d164229aa---55300549185.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/72119833822.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/26798605336.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ec5e7ea3e59995c248ebfcb613eeea06/27365891652.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/8705643742.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ae67bbob94068qvrnvaa49djm1/58396486563.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608218d27814f---tujerewadekofuw.pdfIn PDF document text
    • http://hotechike.com/files/files/17856079473.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/27840935369.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/60239262656.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094da5307025---wamulikiniwijanijezusug.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c67eace75---43712038089.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/36573384160.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/nevawufetisuxet.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/mulex.pdfIn PDF document text
    • http://renovator.cz/files/file/tijenixuzerizurafud.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/borotafawaraturifipelanix.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51935997927.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/fijosefipezuzezadizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=introducing+yourself+in+english+worksheetPDF 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_off0000c29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 10936 bytes
SHA-256: e8112a020059b538cd1fef14e2edd5cf35fdfd844c066cf930e7c1c49c6d1c36
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 15928 bytes
SHA-256: 3a733f99a182c93741681ab3ece8a749d127d74e953fb9ff9fab7338db20f566

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