Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3ba698f41516da…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 16:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bbaa4f038052a4e6faa2b3204bf4182 SHA-1: bad1e1b97ca7003a1a1061a4bf13f9732fab73a2 SHA-256: 2f3ba698f41516daae180035acb301410d26bae0ffdd591efa9f893057b176d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of hosting malicious links. The document body is heavily obfuscated and unreadable, preventing a direct analysis of its content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.institutvzdelavani.cz/files/59553136457.pdf In PDF document text
    • http://badaranquehablar.com/userfiles/files/wupugezaniledapobatewuka.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/26127882666.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/lafone.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/39c9d3f5745368b5a7e286dfd05baed7/87862671162.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/27010259336.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/nebazodazazafolosukof.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/88747192713.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/sasifilasafimoj.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/bojapedilitekofe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133369bc0999---wamigesojibarukab.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/zebajigafirebabolironanus.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/17017930989.pdfIn PDF document text
    • https://alariel.be/userfiles/file/28402310801.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b5ee72e089305d38cbee3c15c50314e4/kobuxaxuf.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/31592058837.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/325677cc066d6ab274782714ec540762/32661369648.pdfIn PDF document text
    • http://wdnederland.nl/file/fipugodaderuxebino.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/pajolomumezugamemawami.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/93786309139.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/53999100407.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wuweki.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/14807348342.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/notozepomunapixabukub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cuda+tutorials+point+pdfPDF 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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 17816 bytes
SHA-256: 6c4fb549105cd8e81d9c76a4faa35168e16f6b5034b958e430e1d852adb57698
font_02_sfnt_off000113f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 10488 bytes
SHA-256: 2f033303b321ad899b66554f1e78b1862478a7242ac0351a0d5048c8137344d9

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