Malicious PDF — malware analysis report

Static analysis result for SHA-256 835cb0725e381ee5…

MALICIOUS

PDF

124.5 KB Created: 2021-08-14 17:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb08a86ebd65f458b6ed3e39d1960960 SHA-1: 63ea3f113aa170d167ae1315b51c6b67337e812a SHA-256: 835cb0725e381ee5bfe92fc2a6bc3a6e77070723358e9eeb64527149ea93e032
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://lapawan15.com/shop/fck_file/file/mivofuwaredokutudavagixa.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/92991424830.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/008e37ab7eb09e32e59474af5c034a65/67526900271.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/rajujexugu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/39473193656.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/bolikojetukexut.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/zurifufurigoku.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2c1490b0---91689806751.pdfIn PDF document text
    • http://kleiberit.ru/files/file/mujikobodukotexi.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/zefusimoralobaronogoro.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/93104962167.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/229287e609c05550f5abebb2b0c0d19f/39732034261.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/wavefumezubumurifavetones.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1be0a879---notipalukivixatuju.pdfIn PDF document text
    • http://altinay-law.com/images/file/27382709611.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/sekebani.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/48074773305.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/55117392863.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nemefiwijimolabuwuv.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/4837908160.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kapekilomunirulow.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/63596710266.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nudigikopugofuwu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a891252f621dd5ba9c2d5fa5b347f2c5/8195224468.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/66787282956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bescherelle+espagnol+pdf+downloadPDF 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_off00017d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19585 21232 bytes
SHA-256: 5acfe2c30e91d53ca4fe78614815e2a24ddd0fed3f190ba484fa91b60d78461c
font_02_sfnt_off0001cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAB8 10848 bytes
SHA-256: acd11d78c23025f421a8eed37257a5b02617b4a087b26f0a0bd767d78aec0d9d

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