Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47be349e4855fd0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 20:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1e93cc4b22d5e2f2db4278d92982884 SHA-1: 965079f796e5f48f0d191b4e2cc2c015169d03b9 SHA-256: d47be349e4855fd0fdbc27e01d12cdae695d829e9454c89e4038446cf9fd2f33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. These links likely serve to redirect the user to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://smidgel.ru/uplcv?utm_term=transmission+electron+microscope+pdf PDF link annotation
    • http://parfumerieindex.nl/images/uploads/76463863409.pdfIn PDF document text
    • http://zae.me/datafiles/file/84771979783.pdfIn PDF document text
    • http://telecycling.org/files/file/79185788270.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/53471918995.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/631852764.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6a6a5c4fe549d728ce57768e4ff274e0/zeneli.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/30141508602.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/dowirinapivekekujonif.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/85464745359.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/walezibevimowufutonuv.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/57493773018.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/9279130109.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135151f7e91d---sovadigivaretuwuxupuxupij.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/46605210589.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/78331670314.pdfIn PDF document text
    • http://briztravel.com/upload/files/xajalazobopawu.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wuwara.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/33466430611.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/35698388151.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16143c5208dcba---mezepabafadokumimesup.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/nilujediwidexaso.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_off0000b06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06F 10744 bytes
SHA-256: 698dec114f249bed37e4abf51b5768d0066e7594b216331fb7f792ccd9203301
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 15448 bytes
SHA-256: 532d4407304069e7d7f0140a32234d43697e4ea610145db4369003624d345649
font_02_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1