Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cf92db85191d48…

MALICIOUS

PDF

72.6 KB Created: 2021-09-23 09:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33151ee3a48f1401b45ab70599ddd0ee SHA-1: 84e9d236443c57b24974218db319a826bfae8028 SHA-256: 94cf92db85191d4818b8ce8ac34cfa0daa0822f61d80d88bd06252a8c3d30734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, point to a pattern of hosting potentially malicious files on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e210bd1a33---tikokiruxenatil.pdf In PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/92191351827.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/watogu.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/33065800332.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/pozowo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dufosibijanuzokajagu.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/68246251841.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631393389.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/81059138139.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/jagivigewatew.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nojotifavam.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/51075573117.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904133614646153.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/piwuzitukoxonulu.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/kilabirujodupujituni.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8aadb424fa28e0f1e5956590451baa73/39635272996.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/liregerekujefalabexa.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/64609246252.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9e04a123407673cae9886c1ffe27d84e/ziluvofigokumisax.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/48115642325.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/magexos.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369a3b312b8---vatuzakamabeta.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/33960acb092bd01bfa31a3b93e7b381b/mewunozumisakorudu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe11e82263---zizifipubojisezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apk+vpn+download+freePDF 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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 10356 bytes
SHA-256: 1c9ef8b304e9b19214a9eb3f6bdb1e5e572e47c75056d2a6b5cd16c17cff8903
font_01_sfnt_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16168 bytes
SHA-256: 6a0aa35a846d901e7453d45209b97916947f8234f1c985f7b8c391c4b395a121

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