Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e069a42056d139…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 09:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 225aa68cb67e565edc20cfceaaebad33 SHA-1: 2bde1e32cc0439c35906f56ecae7022229758711 SHA-256: 16e069a42056d139f740b112c7aa16dc108711dc0401272fe45b98e303094f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://dyneco.kr/userData/board/file/43090204760.pdf In PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/bokowagajakenabari.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109010622044891.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139409d2b76e---nobakaxis.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdfIn PDF document text
    • https://luminex.pl/upload/file/lixuwovifiwetaw.pdfIn PDF document text
    • http://e-menu.hu/editor_up/20033620882.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/56084671661.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/53911158348.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/caea7uj4r33umno7bej6559e2r/ropakod.pdfIn PDF document text
    • http://telecycling.info/files/file/34961575681.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/webekigowimalemulem.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/belatajidegaguveviwu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0536a6c5787a877c963eb218deb90ed4/lelajozerurodoguweti.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/55574411343.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/degozawato.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lulaneneziruwi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f2e30117d14c5f59d07a76baf8d13910/62674939508.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/mapolavavuki.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kadavubijafifokobiwo.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/jixiduron.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/96400470368.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/93304102751.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/95522083153.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gesonoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+fork+the+witch+and+the+worm+free+downloadPDF link annotation
    • 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10716 bytes
SHA-256: c6dc9956fad5a8f4b6d74e4794617df57bf87fded726c82a0707e7db551eb9df
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 18944 bytes
SHA-256: 8f1583c5d53adb1032a6da10cb704b1a9727c623cec78e079e7b8942a2554c28
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1