Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b159a5fa91543f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 16:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d03e253a1c7a3f73c8a76e9a14c5530 SHA-1: 0064ba1a1dd71480f927bc617d9c88181b6d9732 SHA-256: 16b159a5fa91543f0e67257b7aafab05d277190ff9fc9072391874ddf0ba3e25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on potentially untrustworthy domains. The embedded JavaScript, while not directly executable in this context, suggests a malicious intent to interact with external resources. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/39717413986.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90cbcc2d8---nepudifazugutakip.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/xutefa.pdfIn PDF document text
    • http://live-net.it/file/90566124574.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/249e3ff238c38406a8dbeb1d0bd56948/gerizokodiwewe.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fukekaxejarepuvese.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090314474942.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909040235746764.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210915_215307.pdfIn PDF document text
    • http://ropesadventure.com/d/files/leguvevaxerogepajogebili.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gozarimezapunexeji.pdfIn PDF document text
    • https://eklyps.net/images/file/gotuxeziteropavujipu.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/vomeloxupi.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/87213983398.pdfIn PDF document text
    • https://nasikampung.info/contents/files/50728088444.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/70528429120.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/nirojiruwanebegukut.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/fomazoweluwokewidusafeto.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0bbee7e3---41113515566.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/gepar.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/19232818577.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/69761424512.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/86495281027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=emulator+laptop+ram+1gbPDF 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_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 14980 bytes
SHA-256: 24c41ffde48bb4e08634f93c8d623abacc6b5dccda14233d675501f55d0ebb50
font_01_sfnt_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 10376 bytes
SHA-256: c1d33375bedf5a6bd3397a3e40847d7f8555d0701f4c80b7dec635120b0427cb
font_02_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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