Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c70b80b19d9d1b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 07:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55126ed9ffaeaffefdc4562741fc8bc0 SHA-1: 508d1e3e02802d2e794e5e421a3ca5f11e64069f SHA-256: f1c70b80b19d9d1b4174e78540bba3bb8bfde76cfb44f69540af23b2ed66b67a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or credential harvesting lure. The 'SE_MFA_LURE' heuristic indicates the document attempts to trick users into providing one-time codes or MFA confirmations, consistent with stealing session tokens. While no scripts were explicitly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing infrastructure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://archism.ru/uplcv?utm_term=taj+mahal+history+in+tamil+language+pdf PDF link annotation
    • http://hongsung114.com/files/fckeditor/file/11934089088.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/24769840457.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/4799767755.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/953539b3853c9d110bf18c2f221556bf/sinisarusexosigosa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfee7f350---59720460083.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/raxulibotane.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/32175433126.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/27afbefe9b68f85c4fb47cd4af42dbe7/xiverupidedigoramori.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7a4e1737---93673335331.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/cje4l34taorpmu21jqbluhn7ko/maxowasijuz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5c508d61---99875824322.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/80175159448.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/55341172093.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/pozizumidepunab.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210612_040020_1912.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/suridapowem.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/78181583545.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98c6c64306---41941454941.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/lavepogav.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210721205549.pdfIn PDF document text
    • https://stauber.lt/images/files/73649239100.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/18839570470.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_off0000bdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 11252 bytes
SHA-256: f50d583461791f1dfe2983fdb1902d7a58131155fb22a8b2c979f570ba0aec9f
font_01_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 16912 bytes
SHA-256: 6fab00ec4bf8f26ccdc149dc6cd704babcdc5d9d36c152e63e1764f8f2ec0419

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