Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0077903bb9dd73a…

MALICIOUS

PDF

81.8 KB Created: 2021-08-06 16:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b358f57440c8e3532a78cfae2d1bc7c6 SHA-1: 6d8cd94a237e0b8e6e17981c55c26d5903e64d32 SHA-256: a0077903bb9dd73af9758db1eb317870e7555f7e0c2d28d4f55ebd22d1142588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point 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 malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://global-leasing-management.com/uf/file/4930478310.pdf
    • https://medsplus.us/admin/images/file/nugebobap.pdf
    • http://szwygs.com/upload/70731560664.pdf
    • https://gymlesgeants.com/upload/editor/file/geriwamidivumerijemenobu.pdf
    • http://rhondachem.com/d/files/tefetovufokani.pdf
    • http://advicetao.eu/pictures/file/nowozuvunijesive.pdf
    • http://studiofantino.it/userfiles/files/84025186617.pdf
    • http://caratow.eu/userfiles/file/sokenuzabasaxun.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9753d0ae---69874744235.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076409814027---dewererunosixilofize.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a198994410---vadosusejufixuwibujise.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b2379488---80769004955.pdf
    • http://hndgyl.com/v15/Upload/file/202171473487529.pdf
    • http://hoangduy.vn/vn/files/rozibuvamuxogalezipi.pdf
    • https://pnp-studio.com/fckeditorfiles/file/42913019245.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f51cf3c2e---32769172799.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4cd0f8ba5c0e6f5cc842ab2a2391c25c/niralowonedopota.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/mijix.pdf
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/gizakuwowatomelagoxebaka.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wujuwoledakakutijupoxefa.pdf
    • http://twxcd.com/img-aim/files/somobasafa.pdf
    • http://wooshin.kr/uploaded/file/95073584360bbe04384ecb.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/lototubekasazaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=metodologia+de+la+investigacion+cuantitativa+sampieri+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a1.bin
49dc7e25a9fa828705040db74331f5087a8b73aa2606439e5ac9048fbf67965d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 11124 bytes
font_01_sfnt_off0000f363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
font_02_sfnt_off00010b75.bin
3cc4ff1f88bb6beff993fdbe82e783168c00640d0398995a63c37668a18b0cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 17256 bytes