Malicious PDF — malware analysis report

Static analysis result for SHA-256 125b63e38f9f04de…

MALICIOUS

PDF

97.2 KB Created: 2021-08-02 01:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b489b5d3a33d150b91ff3ae99c3bd12 SHA-1: 7092c908213bb05d3c181c2b11eefea33a10967b SHA-256: 125b63e38f9f04dee507c0a85bc7d452de1a92563098972647b8b0eeb7fefe70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farms indicates a high likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.tamtrebinhminh.com/public/files/rifer.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d4ce60c3ae6daffb48e95abcdccfd046/7225291323.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bc2f20c9---24620610625.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/rexupozerofeginimegari.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c227de44c4b---83470772450.pdfIn PDF document text
    • http://secretinvitation.net/images/files/zafasuvopezowanoje.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/24307046531.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e971e57fae835944df91d79e4ead1b85/vodonogu.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9b745d240f5da9a316651a446b16f38f/98102704551.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/6846686238.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/a48a9d0ae56637bc382e748f3130d41a/zexakop.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78a3063b29---nebapebokinajatomufix.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/7eea51afbe79adf1c0af191aadad3ffc/nosori.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/44532027646.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a234975269f---belez.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/88668257641.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xikofod.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/xojotizaguxilumulek.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca6ad070c---64513806620.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tokujr6a56o0hopjng9e5kvbig/durizara.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/47012241065.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/502c7bdd4a4c1354a9e7cbf686c43d43/kegejovixuzenanina.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/29564072560.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d4fb352e---46413340846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+you+watch+wyze+cam+on+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 17664 bytes
SHA-256: 4428173c85aa5120ad1893ebe1656c3081528e853c9aafcc5366264acbeaf821
font_02_sfnt_off0001462c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E43 10624 bytes
SHA-256: c63e382343c2667601e1c21818c6c07b3b46e7ada19bb566c4213786529a84cf

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