Malicious PDF — malware analysis report

Static analysis result for SHA-256 837ee3523441d19c…

MALICIOUS

PDF

79.1 KB Created: 2021-06-28 13:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0852eea097069de63041fdfe0b255c9f SHA-1: 83e2514658d08d8bc8e20454cb91507eeff00959 SHA-256: 837ee3523441d19cfe76c0f81a9402f3fed8b2b1252b6ae3e9626d552d4c18fe
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to trick users into providing sensitive information, such as one-time codes or MFA approvals, consistent with credential harvesting. The numerous embedded URLs pointing to compromised websites and disposable hosting further support its role as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=bearer+card+meaning PDF link annotation
    • http://ajtoablakcentrum.com/_user/file/28559432702.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd53955c5d9---kopito.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160913d9dac7a2---vivomepotaduwi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef1ab3675---39301517826.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ac524196add12434559ab535b39bcc44/vabijerawiwagi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c238b0a4d61---tezituvizutemipo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eafe5b516---mepepomol.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/31792508159.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a67a8be06e6939e7ac97a5d922203260/guvijanumed.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80ce93fdd---walova.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/65951038089.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986171dd005---72328854436.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210621184230.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ximegiri.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/towizilobepulan.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b70b7a374bbf3884919a4f5acb9aa620/tefufegodiwafovowosuwi.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/17311904208.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/dipakelatimepulowojizubu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/masika.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/0e12157797ad40311cd036d1bbe0b9c9/72441264383.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060909293043.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39d5c87c4---44927449891.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828fe84011---sufodefapudebumi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fa472bfd485f20baa66ee2ef174e38ee/37358615433.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e6e7b3161532d5a71677b55ccf4065d7/20740535932.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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 10336 bytes
SHA-256: 31f6475e121cf1789a904eb159d245d0548b35d8796f17ccb89792da138d8a04
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16568 bytes
SHA-256: 29e70cbd1c1b71c96f2829d00dd1a2ea4ca7837857ee05d858abc3f1c1d74557

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