Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9e93ae1a294ec4…

MALICIOUS

PDF

109.5 KB Created: 2021-08-06 17:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fca2473cdd7a98f9ba0aa748c9cf912 SHA-1: 3a88759f854f59bb3c42db6010f9f40042f11c11 SHA-256: 6f9e93ae1a294ec45be4d9c88db33e05aa95836cd6b0cb4c0f44dcfef437c121
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_FAKE_CAPTCHA' heuristic indicates the document attempts to deceive the user into performing an action, likely to download a payload. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://philabc.ru/uplcv?utm_term=is+nigeria+police+form+out+for+2020 PDF link annotation
    • http://hiroi-es.info/yamituki-n/uploads/files/82892356153.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/102694b92c99dcd18c7faddb4cb97674/17474997644.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j2klur8935vdgiianbpsvr5i80/xipamajuziximixojiwedobo.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vazutidi.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/mitekegofedila.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/823116916.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/webawokefeje.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/rewufugutejunufax.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/96584657163.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0f7bf5f5a6d312e74f7a089e81d742c4/30503048102.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6c06c639c2328137d743be1ded4ffb34/47775483073.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v5oltnuoqij215vudip5u5fcgj/zowipaxasalafenojowopi.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/jidizimobufumugove.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78e7a1908941eda38cdbcfafd6012f1c/karinodiwesegafalolof.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25af0f53e---marodavasa.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/57205696687.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c746cc5690c---11103245685.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/764025895.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210714074754.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e4f2add2---repitidem.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0eacefc85---96287364844.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/pilugofonatoxuv.pdfIn PDF document text
    • https://landi-bg.com/images/file/tajuzeta.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_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 18468 bytes
SHA-256: 2a8a0e4f948b71b06704e2d9355233b091fcc3f569a11cb7f77cc3a70e32ab0d
font_01_sfnt_off000175bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BC 11116 bytes
SHA-256: 4d33d75187a746a6a9a80568cc4a6f35564c3e3a681c00a170383a0bfaf6fea4
font_02_sfnt_off00018fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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