Malicious PDF — malware analysis report

Static analysis result for SHA-256 151ef3053862e37d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 02:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f5396ee0e69ac909b487c4cfa20d30b SHA-1: 43e25a218c149111f13584827d1b384528184f65 SHA-256: 151ef3053862e37db9cc6d039d335c20bf21844df3824d6aedcdd6544d159da4
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials T1056.004 Web Browser

This PDF document exhibits multiple high-risk heuristics indicating a phishing or credential harvesting attempt. The presence of a fake CAPTCHA and MFA lure suggests the document is designed to deceive users into providing sensitive information. The numerous embedded URLs, many pointing to link farms on disposable or compromised hosting, further support this assessment. The ClamAV detection and ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 9

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=msn+hotmail+com+sign+in PDF link annotation
    • https://xcheck.vn/uploads/userfiles/file/masisejaga.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toleze.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/jebib.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/disikabebe.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/zavijavex.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120822556603.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914110029.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/wowalaluxumagoj.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/2619220455.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210917191322.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/40922853488.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421732cf907---befipatejudisutavo.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/97147663329.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bmrnh4689l86sejlb1s5hd1bj3/novaxizisedapinurafepipag.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bitovedal.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lvao3tqv9m6b4fpo26hntd97su/xozimi.pdfIn PDF document text
    • https://thehouseproduction.net/file/xarinawifa.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/8527136186.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/21748964425.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b2488550---pumigibeturemu.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/folubudefonogifoja.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/95451836346.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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 19272 bytes
SHA-256: 5b0d98a9899312eaa5f6ca264978984899e4bc2913a271d4ccf2d03a4fba279f
font_02_sfnt_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 10440 bytes
SHA-256: bbaff1208a573749a985717027eb61b0d8ff6d413733c7938069ea516a971580

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