Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbec0d664885261…

MALICIOUS

PDF

94.3 KB Created: 2021-05-10 02:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 422d48a0958bddd053a2f7ce066d1ee9 SHA-1: 52c17b24dbc2415a16e27dfc2557a6d99cb1078b SHA-256: 0bbec0d664885261f6da5e1e7be11c2fb25657fd2efb0a8e6041f4d57ff97c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, along with what appears to be a lure related to 'neuron structure and function worksheet answers'. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076b62f5661e---wolowuvudonuxub.pdf In PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4f09e13d61e2662d1c29ead2a4ee6832/1020824740.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eafffb9f21---wowaxogifobezexekovasizik.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869cbed91e1---zuwofusaxapixowefanowege.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/fazudeni.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d336a17ed---81126955532.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/40328643954.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090176c86663---57280314608.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ht53ffo2d63n71ntavsco0im8t/pazavogomatosoxosi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d3b383914e167140bccd7a2f1afb99e3/rotak.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3eb09e39c75591e24d9c060ebeb5b540/kukuwewek.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b6f7e8f9010268f8fb60e79015f997d8/82975403246.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/46415844551.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/027djfo7jn58eoiu0kg02omm2v/10423890257.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/sonuxonukipoxitewemik.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2e505c66f6c107d2cc064bd5d3bcadd/93949275938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=neuron+structure+and+function+worksheet+answersPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d0a5fca4---gisumepunikazixanumenagaf.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 5200 bytes
SHA-256: fb12e397d6253794c40d454a5d30996b15d4344228a38d800c48f1d44e316e8a
font_01_sfnt_off00014754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14754 10732 bytes
SHA-256: 26c6898644863fa070e13ed4b0e5e0798d045c05e8a50f2d5c0238b3f0d88262

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