Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86568570f942536…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 11:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cd6ac29ca9f0387474118ec75ea945b SHA-1: b069a1095e74d1b296e1d80dcdfddda0f927ee09 SHA-256: c86568570f9425369963efdc19c43e10bf7a80af2bce6e02cb75136fd5d68d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://libertyquad72.fr/userfiles/file/3984136374.pdf In PDF document text
    • http://www.donboscovizag.org/images/files/kilejejosiruxojivep.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/35653614172.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/zufoxazoneduriperisoveg.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/sodorulilepokefi.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/77811157232.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/juvizotivowexaw.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/gomoruxuponizovoxanopune.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/27658881991.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbc45ecac---76415918273.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa4d4bc76---ravexuwege.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/fizulen.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8ded991718e8e863dee528b45582f597/xigor.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zipukufopagalagov.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4e55dc015bd1bc22804f27a5cdbd62c6/viwilavomamipeju.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/7589146500.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/26972856834.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/nolupakebejiresejinowabad.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dageduwozakuxaputezuxiwe.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77e0ce5999dc5f721fee21174ca676c5/gutanimuxub.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070010b3c4f6---sobabowibodulabor.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/tajoterojorogexe.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/39493176269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=order+of+operations+with+fractions+and+exponents+worksheetsPDF 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_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10976 bytes
SHA-256: 62ed277c3b780d2476088d724e313e959d8516a502565c804766c137e27eb7d8
font_02_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 17800 bytes
SHA-256: ea118c72668aecbdc8f68c0668831c098dcb698c3620751dbbc1652c2786a95d

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