Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7f436c53e0d38a…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 10:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3764dcd566a4c50499652210f3dd1572 SHA-1: 7f8aabf8b5bcbffe9082f244287fb100f5460c98 SHA-256: 1e7f436c53e0d38a59ac77cc70d0ae3cd3231ac849e3b1281109babb06549b56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall structure strongly indicate a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e6f8b44de---tukimumipilukosupeb.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7cf758b3964511e0e3c4ca7bca87cc84/pisupamamasurutarul.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c987d0a2996---xubewewugilosero.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6a5824338397be7031aeada6f85e2104/70576199921.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b06549dd116939577158f47f69ade434/zawutulugokanonikepokuno.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083708f12b89---2660189366.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lr498nafqlis37hp7990qu8cnj/88462886091.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/36228074936.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a61d94b396950c7d4883c05eb11f358e/pelebixovorekorap.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/padefanamejojom.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e8a657ca---tobawubifetezunenuwew.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/83925611464.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/durowafepudukirexovuxa.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210624_105752.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54ea5ff84---95286546457.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/3ac398e4f43d0f24d469aa9c0778411e/27823095793.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/6224562824.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bde72c84497c04755cb3d9f2e9726951/majojipi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88789d6b2d---fiwamirovew.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c2d104794c0a9e539fef4ce9c9474496/54216861573.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8813ad3---40437733846.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/56994115233.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/lazisiralabadimipenofa.pdfIn PDF document text
    • https://ka-base.no/images_content/file/60895854804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+sexy+mobile+gamePDF 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_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 18236 bytes
SHA-256: 7c86d3bab8f698c7975d1a1143c48223789f44e53693af1c2978d4840f384ffa
font_01_sfnt_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 10656 bytes
SHA-256: 245cc514de88a32c3fb48f4ab63770f7e32c4a1bff84b73ec0d51ebbeba56e12
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1