Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d595862bb7c3c93…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 20:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bbf38b9536ddd546b5c9f097f5a0cef SHA-1: 84b0224fbf3f5c7ee33e2e66e501184deb32beed SHA-256: 6d595862bb7c3c93f27f49aff5c9c71a72b2ab601e5fb2b6cad7f20d56f5de4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment vector, aiming to lure users to external sites.

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29a2a1188260af427bb640da521d46f8/46723855360.pdf In PDF document text
    • http://pinturasoltra.com/images/slider/files/11953323645.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4494d031a---10629007327.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/gemaviwexepusefux.pdfIn PDF document text
    • http://lucann.com/Upload/file/28183246721.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/navadifigobabek.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6269c93f50e4b9392e9a55e1a52acedc/37127058958.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bugopiled.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/temomujajokivilimefa.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210619_817456DE477A534E.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/77866824431.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/pejukogunerarani.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b1a6d903e40e2f080762efc1c991812b/newugib.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160787d7497926---25237953234.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160764dc4cea4d---tegikibobajubow.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613480b447400---zelenamifilaba.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4n59ocoq619fo58qg00vsi9fcs/60968607078.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f77d43ba5---40087998872.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/11821778248.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a89b87dd---vukudisosafifopupasik.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e76d6c0350---fuvigopuselan.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f4d3a4e7cb02d09ea1bedf9cb4f2016f/nokoki.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/31879824004.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/zojet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mastercraft+air+compressor+3+gallon+manualPDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 17376 bytes
SHA-256: b3e71e136290166352455a704c74d4e5f4a949fc5ce5fd76705a7ba8e653cfcf
font_01_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 11088 bytes
SHA-256: b55826d87692979a0e49121a10a23dc813b71a73e25a895b4b9b5006cb025eda

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