Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c327a626dd79e77…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 07:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5e5555fad50a2d55f8c38431ac173f3 SHA-1: 00c1a3541b7da86a2d6d2e5fdc00db08e46203c5 SHA-256: 0c327a626dd79e77ccfb6102fd4d8b6988f401180f335e9e43c00372785efbd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=public+administration+pdf+calicut+university PDF link annotation
    • http://imcborivali.org/userfiles/file/15629583861.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39523b01d3---gumonikosigit.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/sonobunepiw.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746d5510d0e---84014754472.pdfIn PDF document text
    • https://aksusu.com/upload/files/vikafefegobaviposujus.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/wupuxijiluwuregapivo.pdfIn PDF document text
    • http://bdn10.cz/files/file/84118571701.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tfh8uqam9ah1bh540u0naj2a30/pesoparasup.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831ed7d647---vadibofafosuvik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d9f00366c---ripeluzeseronido.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6cbb0d21---76641386436.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/waduguvunagolokikixu.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/jotebowuvakabi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ff3739155c3ea611f27053319b14547b/82970818746.pdfIn PDF document text
    • http://scantech3d.com/files/wupelemagofenadusidibep.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/5766892542.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210826_BC57B261F44F1399.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/76058898014.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/wuwovawewagovuwibulemasab.pdfIn PDF document text
    • https://ancoraeducacion.com/images/84287971848.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098365766482---4251044585.pdfIn PDF document text
    • https://huanghecables.com/d/files/84564486359.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/511ae2cdecd2e5797dcba2d796ec8e55/tasajozixugadi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/49567748206.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f809a21224---93887882623.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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 17112 bytes
SHA-256: 2cc5fc6432746d6231aea92d3f55e39b2b13b4adac9da58232d5e8dc4a1c938e
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 11200 bytes
SHA-256: 232337249f0c24c345d9dd0ff7415f3e5d78ebeb741bc2453c361029642ff701
font_02_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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