Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a9271426d42dbb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b69dd57ad80caef40547a36115c7fece SHA-1: a1240136491f9ea642537b35aa62b2bd96cee567 SHA-256: 01a9271426d42dbba3cd566f4e6225fcedbacb68aaf2feef716b67fcb9c48f51
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 a pattern of creating link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript, while not fully analyzed, is a common vector for further exploitation within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://teakdeck.pl/files/file/midozokureda.pdf In PDF document text
    • http://vdavloeren.be/userfiles/files/53262928856.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/34659427366.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/2121731793.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/39693403607.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/vazovulebikubizafediz.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/tabopejanumo.pdfIn PDF document text
    • http://upakuika.com/img/file/pupijaj.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/karinigikegususuki.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/pijenagolumusorawide.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/3178628119.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/40541739661.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sujasame.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece79691b4---bemozelusosujosokalogun.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/79323659627.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/69199434350.pdfIn PDF document text
    • http://dsraxys.com/uploads/pojujuzopuribazegopubewug.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/dakonunir.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323d9db0593---72412143119.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/61814292325.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4d8e27c6---33558491317.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/86375115303.pdfIn PDF document text
    • https://krusomying.com/data/file/789754462.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/58203559610.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/jakab.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/83456204470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+cathedral+and+the+bazaar+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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 10500 bytes
SHA-256: 3da77a1af6b58591d6e26d6d928cc080b48eba6c33b8e921e8e14060bd5e5096
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 18308 bytes
SHA-256: 6e6be6af4004fff094d6bb2709aaf24d47a43f35d97d774eb548e8e8aa5fb94f
font_02_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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