Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6763ca06963a55c…

MALICIOUS

PDF

83.0 KB Created: 2021-08-17 14:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ee37e65c0b11f6552f82d4d814116df SHA-1: c6b0acefda77558df0a55ca68b9b658285398df1 SHA-256: f6763ca06963a55c41ef80de6c43792c604e825432520d7660164f02514d8146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being flagged as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ketchas.ru/uplcv?utm_term=applications+of+endothermic+reaction+in+everyday+life PDF link annotation
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/bufetemopojokeduzafito.pdfIn PDF document text
    • https://digireg.cz/upload/43400052182.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c906806a0afae019994a6adb915d39a/sawelagerogurezab.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c3f8cpt63neaqodl1e4au850qa/roligubumu.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/diwibomiludat.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f98a8292---60649358034.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/301735589.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/72205856973.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cdf16297139a89525ffd5c13123c8f6d/78167885936.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/13380193051.pdfIn PDF document text
    • http://africareview.in/userfiles/file/tubukazeke.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/9058853730.pdfIn PDF document text
    • https://stvorki.ru/files/file/84304276873.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6aa4eca96de70dc427a857fea4aebdaf/61267804904.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/94858591136.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160735c97b4a35---mufisunawuvapafuwosagapa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a2f6ea8b---82876062046.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/97583076902.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a2b584a84---janufazu.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/51956345925.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/54724779817.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kiturapafidipifovola.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/guxuf.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/64302804422.pdfIn PDF document text
    • https://fallsplat.se/file/tixolaxod.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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 17740 bytes
SHA-256: 087ecb8dfaf7aa207fe1de2ddbbd48eb595854fcbe56d4bfd1fe636b071c409a
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 11048 bytes
SHA-256: 85c9e44b2e07987b89715fc002a1bd472f00496db47a62eef14c89db14c8feb1
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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