Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee807875d8f995d…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 08:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af7cbdcc796ea6b94be3cd722d04397b SHA-1: 4fb0c1da0dd85da5a6add8c13c89cec38be81eca SHA-256: 7ee807875d8f995d7f8e161d28f04bafbb201f643eae2eb162077455e6733bef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sys-svinding.dk/userfiles/file/67360306966.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a682ec39a8---rapodejivorerewakof.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6663b31a4b45cd3475b4b79045e12524/26576816382.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26302205944.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/5502946016.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/19dm0rjgmjvlua9cuv46mheu3r/menaji.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/rawegil.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jixiziva.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t1rrp1n4vkkeagjq9iiu2334b1/35851384850.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b8d72081---75647838970.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b82340ac69f---gadilotofutuw.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/7468319656.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2750e793597f35774dfb03b4a6434d54/14105293210.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/nonoregitoludasidus.pdfIn PDF document text
    • https://ckmandarin.com/uploads/kulesikenafozelajudi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7cfca78500622e028fc44525e930c767/ratafuvisofaropara.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dukubi.pdfIn PDF document text
    • http://evola.it/userfiles/files/zovojuvosadelasefeji.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sopidupufosilufufevoxoduw.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/subazuvazafipu.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///70862835771.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rugpvb9ht7td6bmb1hghubarf5/fasopapuji.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/97872829659.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/xawavitufamitel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mapa+turistico+belgica+pdfPDF 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 10924 bytes
SHA-256: 2ad5e54d2df481e64eacebdb9662e9c9961662c2e5697d541a5e871fe16c284a
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 19540 bytes
SHA-256: 73730fe68fe5c2a7e92f74ceded9521732444639961c90c52c7cec94025be639

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