Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12baef690fff23d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 10:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 898dcf2575a30a14cf7c08e44ce80487 SHA-1: fff4bfdbf68710ef9c2cc80406c514bbd5983538 SHA-256: c12baef690fff23da911e2fb61c034c8fc3e3149efde8443d3059976ec91f5dd
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a critical heuristic indicating it instructs the user to disable security software, a common tactic to bypass defenses. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS upload directories suggests an attempt to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf337256b2---86304010681.pdf In PDF document text
    • http://gdlianyu.com/uploadfiles/file/todifotixamo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d93801924b---78428946135.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613300a93465e---13276069402.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/32209153351.pdfIn PDF document text
    • https://network-italia.it/file/17287927700.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/33966688030.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/53296965620.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/35260293088.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/roxikogare.pdfIn PDF document text
    • http://szm.hu/userfiles/file/welajivevomajenim.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/69676739227.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9e65568cde9843ad8d52bb20ab734b82/muvaza.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910111136086.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/72475030442.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/19513788089.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/muginareguwodewofi.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bolifimefok.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/50164098184.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/jovewirozadewabiwos.pdfIn PDF document text
    • http://12shio2.com/contents/files/84866949094.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/wuriken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+install+metasploit+in+termuxPDF 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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 10692 bytes
SHA-256: e22b6d80b5db4f54de85cc7f52bacdef86e276e52dac8813800698673becf9ae
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 18160 bytes
SHA-256: 9fa378566067c4504cb99ab025559a2a54122feee8c5eadd7618e426fc1e89f7

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