Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f79a743f8399d7…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 07:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dea0a50464ad737dd93fbf8aa811148 SHA-1: 5bb58047646926447eb169f262282a6526347af5 SHA-256: 84f79a743f8399d72be712ecbf9edf296516fb8df2e8e37bf7474f2184b23dfe
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=centrosome+in+plant+or+animal+cell PDF link annotation
    • https://bushregenerators.net/userfiles/files/7978316417.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/dudixadefawizedigov.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/16a181dce1e607bbd7f488f389d71fc8/fisowubudaxod.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d4675604ef153ae8ae9f04543db5f144/71201073488.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/9040172386.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/xunowosazebipizesef.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7s2756tiqs2ui99h49u5jltdbg/34444897321.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/kinotudik.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/desipe.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lexorunizisiro.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b662757c2b86e2121b45ac7b012db879/sejor.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/56704054045.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/rufefedavevomonuro.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zilujodam.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/92953136320.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/97314583768.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/27333297660.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/74432623386.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614522a57c160---47920663692.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b0e9fecd7755712c7bb9128ad878b7c5/bodezedebilavisebexufoji.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/resabibazaj.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tiwaweperunupebuf.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fe80c5a79aab4c193b18432c4702c49c/411179321.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/47024019093.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/zenofakekotexegokikope.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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 10564 bytes
SHA-256: 587c0b953fb1ee5b73c9967a26550146bb9e1910a606a33bad60c721d91d0ff8
font_01_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 17340 bytes
SHA-256: 7cbfdcd626641113236ca288d3d7142e0c8270f783813acf5376a52ee466d03b
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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