Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a55fae16d3c43c6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 22:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5569d781ab9f780f241c1cf10fd5e722 SHA-1: ea7c9dc0d76f6649618558b272a3129dcaa6b19b SHA-256: 8a55fae16d3c43c60904cc1b1e2511d2e86ec0d918dc5ad46f2c8233cb41e8c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=pokemon+moon+emerald+rom PDF link annotation
    • http://tuzy.pl/Upload/file/satogutotinaw.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wekerodizapafil.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/supazu.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/sofanimokoponururebejufa.pdfIn PDF document text
    • https://everestart.com/images/stories/file/35230154193.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xutamidesezapakekeku.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/nazebedofufajetokigu.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/fiboluxugukulosanuxumiw.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7khklj53hs022qkqt2j746pfij/xuxupitafe.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/88869505674.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/18504243925.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7ju2mb5sq09d553458rooqhm7i/zelugejomawamolekose.pdfIn PDF document text
    • http://twilaw.com/files/files/88781642125.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b477528655047a13a51e244fe09a1443/kepapepepowozalepanufuwo.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/rosafusisodexe.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/82370721204.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/dfedfc48aedc6fcc88a1389623f30fc4/mibanojejolagadujudagusat.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/tinobabujudelafaxigu.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/nufebanurudixazajas.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/gupikopikagukofeso.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/94a0e17ab06231ef59dab1d301ee4715/dabigafule.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/sodatalebuzipelawag.pdfIn PDF document text
    • http://foxadv.net/file/47408356620.pdfIn PDF document text
    • http://zae.me/datafiles/file/lebazezotuduwolemobinu.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/kafogedililep.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/554167572.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/nijizojikomozunobufezot.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_off0000b3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BA 15148 bytes
SHA-256: 089d663d9d481d7c17f92f4460de8ea352e803e22adeb3bc0acde5f23e6a1fd7
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 10144 bytes
SHA-256: b1930390a00d5b8cd6a1286c8eadd7e408b473b87cf9667fa88b2160824d8394

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