Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c4ca19f43b134d…

MALICIOUS

PDF

98.8 KB Created: 2021-07-02 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c47e70603ba314aef1d6c751a1ab3adf SHA-1: 76dcc13070473afea8efc6371f28f019e74e80da SHA-256: 25c4ca19f43b134dd565881792bbb27422c1f4ae6af9f80dae57990b18c8299c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, many of which are hosted on compromised WordPress installations. The URLs suggest a phishing or scamming operation, potentially disguised as legitimate documents to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://pixomot.ru/uplcv?utm_term=introduction+to+financial+management+mcq PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d7ba07adde80d6289bc5725da3a1d044/vasuxigaruga.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tuxig.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/41217692766.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57f04c1eb---mususixoxolimipefigeji.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e76aee87---8895882638.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095502bd22d9---mobonivobupafisugifa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p15jt7nns7v16sjfm91uknkf18/mogojunekutadonenofudika.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/45927792376.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bfccefc50f093e30efd4dacdd44ff354/dajadunefujaki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31c50404ae---10666188341.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8ec7f1208b3b0ee0e55ae4c1adfafa58/valeresego.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdaac5607---65168512184.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vekodoba.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a2862ed8---xeduj.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086387c37c51---dikoporixisixonefeke.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf30e3915---68016121445.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6086925d---sipupejidemikalewudiriler.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2871124e---gifikoz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c51d5ofl1qtd37hlljp3oh01pm/40980511948.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/15321840930.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837ea23bfef---17226025550.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/6749073403.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/seesmmiq4o4e8sdp7s1lvpqj1n/21462008794.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202165162894672.pdfIn PDF document text
    • 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_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10848 bytes
SHA-256: 455160e500e637e56b5afc8d40d033c06c1b6f35a61352b4ab7f5d1d2ea9eb58
font_01_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 17996 bytes
SHA-256: 885d274231763e63e2cf59ef80c74d40cccbde8cc65ad6efdadd09fe1228dfce
font_02_sfnt_off0001655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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