Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7269adf1539af0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 02:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3a0f69215ec18f7b404aa0aa63a0065 SHA-1: 39530fec929e3f0e7626b0aece765d990ea2676b SHA-256: 2b7269adf1539af0dc92d089bc1164445564546b88022b0ad8db80a13f1a8ea4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript stream and the presence of a link farm pointing to compromised CMS upload storage suggest an attempt to redirect users to malicious content or downloads. The document body is heavily obfuscated and unreadable, but the heuristics indicate a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://agapetown.net/ckfinder/userfiles/files/dijivawu.pdf In PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/23787890364.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/f1da7ftac8donukfjc6g21j075/65863728735.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/tesafizitafimugivafijaf.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/88051645123.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109080425288532.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sopaza.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/warekivowejegepolu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613897fa3d56d---81326495214.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/valeka.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/23526278789.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109170514409320.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/wegobumas.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/soselefumu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c479cdf59---97373889521.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/juzubasukubobi.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/67769278102.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/9062363635.pdfIn PDF document text
    • https://profm.hu/files/file/mumowoka.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd3247d95---30691106451.pdfIn PDF document text
    • http://cartopack.be/Images/file/rezufedokevawilakoremane.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630554338.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/88m95soupsas4m7lasi54rsoic/ponevifefitebaxugi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd7b29244---40570116664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=indian+play+store+apk+downloadPDF 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_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 16412 bytes
SHA-256: 97172adb42f43631c2e863a599019f631b5a3901010a7652ed1cd5cd0ab6d384
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 10628 bytes
SHA-256: 51161ec1fdb9ec54fd40864a9cbb210efb18ac8a77f77d112ac14dce24f29f58

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