Malicious PDF — malware analysis report

Static analysis result for SHA-256 829ad2b45a52f583…

MALICIOUS

PDF

89.8 KB Created: 2021-08-12 17:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3ec44c1791f85347a0dfa383e4bc4b72 SHA-1: d14827c517a8e3e7c27312234a7669173dfe5fb3 SHA-256: 829ad2b45a52f583c50d3092a0c9c925aebccef55f0422c3119e80cde063b720
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://capecoralliving.com/media/file/lizurewosezekul.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94e33415---bukekisarovofodisomurig.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/21816961698.pdfIn PDF document text
    • http://thongthien.vn/upload/files/76918635554.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/kixosubi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c5736c28e1a---16308178377.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aea15078bed---4372774600.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/68052456216.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/pazamajodonodatev.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160848d7dee304---pimofinonobijabadejar.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/8609794541.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/19652965194.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/pafaxatetoropevo.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/gutifumasixiluraritubu.pdfIn PDF document text
    • https://proxus.nl/file/gewoxagowosas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954de9eb037---gitexof.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sijojuvenobuxomukiwej.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a71174ef---fifurupadaxoxorimuta.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/77032413465.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/sepituriraziwalatulivu.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/basoguxuzoxixurekalosejil.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4e687190---puwofonigogane.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/52611501615.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/82313130846.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/10384478284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=active+vs+passive+insufficiency+examplesPDF 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_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10784 bytes
SHA-256: 1056fd25b8eea864a99abdbd1402fa34a6f3de745dc79ac10cf6b2892dee2bbc
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 17580 bytes
SHA-256: 2da37787949f8430c40aeebc1bd0516f583e6ea823b849770981ef9f5a3c3cde

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