Malicious PDF — malware analysis report

Static analysis result for SHA-256 df95d277011cb68a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 16:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af29eabba84fcaeff6a2abf1eb14c11a SHA-1: 0b14e6cccb1828b12cf18df8f8678f277c52087e SHA-256: df95d277011cb68a0c38122e25c5e4a5f45a9aaea22f265b81d37eceb0f5bbd4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://benqmusicworkshop.com/fupload/file/56138998417.pdf In PDF document text
    • http://skonasystems.com/userfiles/file/14222465090.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa2c6cdef---84091056652.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/84080792746.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/90030716160.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/210822237776.pdfIn PDF document text
    • https://noddy.nu/images/file/bozokizudekilojejipeduwem.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/8442699723.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/13527307674.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84062c53f---dewiguzixuxovakog.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/801270f41fb5dc362391e7ffbe080029/definuwebutuxudirel.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/43448200852.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/basosu.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/68894266231.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ea3dc633---41478486582.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cuqeqkrenccl7m91v10vuabj2s/jinoxupamilimodi.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pegamujiweto.pdfIn PDF document text
    • http://huimao.com/upload/rarakazebigonokenesidu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612a776108133---90105430493.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/98388486041.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/soxesiri.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160797af73a623---sapimezagele.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9348d8e8b---fuwavekirijotufosesuvel.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/deradidogibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=arcglobe+tutorial+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_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 10744 bytes
SHA-256: 80629df18bc46aedef72f0aa770d8d42b61c94d4bef57bc75a4ba8fe379b86de
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 18692 bytes
SHA-256: da145b7a5ae80e854726793f966a5b56921e905526cda63697ffa66155ce3322
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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