Malicious PDF — malware analysis report

Static analysis result for SHA-256 676a3d1e0e97086c…

MALICIOUS

PDF

88.3 KB Created: 2021-07-13 21:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d95c9ef90a31f3cb20fd0d188d127bfb SHA-1: a84c8ab16fddf43c02dc91a773679e857daae8a3 SHA-256: 676a3d1e0e97086cf191bb3538acaa18b9fdd0d20831610a2b8905be7e951304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160941891d1a5a---4267166165.pdf In PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/77421816645.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mgn9uo4k7t8utan58mlgaehdsh/fufexobavemizagon.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bfuonjaq38jq9j2h9vlgl9ftet/10778545434.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/ninijasexuduguzupevogala.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/14f906b23f581a72ce075eca4c736a05/paziwatarobefupogamino.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/lariwufevufulowajovofe.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/luwezexazovo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160713fd92541d---12417797039.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/70114424043.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623409850.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/wegipajojuduzini.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/binafelolu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced672e6d92---54663013968.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e72faea0c---repatamudi.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/gobowuziwivusole.pdfIn PDF document text
    • http://caramelitos.sk/files/nonafuxujofexizaxalatusip.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070542e7aab9---pokiwede.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/zobugoborupozedob.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c329af730---teropega.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/73c7cb8ae8d75110d782a8b5b6c1e171/36935348117.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/52846058663.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2a68e42b56c107a0de8b2669fa6f8c67/73909162425.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/natuno.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/387scb7j2pvaoddnigrmgqgvh1/wisosomaketo.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/22868788850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=saponification+the+process+of+making+soapPDF 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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 11048 bytes
SHA-256: 83d372a7726d96348ef8a25a63d6159c5d9dcc9fddf7099df5131c0512e66f8b
font_01_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 17156 bytes
SHA-256: a36117e208feba85ee962426f32995957ae7873d6cc63e5973f369f835932521
font_02_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1