Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3023f8a6aaec2b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-19 07:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 121af009dd0efe5da6c75971d389b7b7 SHA-1: 28fe5012fdcf83d0314c15f0691fc00683ac3ede SHA-256: 6c3023f8a6aaec2b0304afddada8988b647a7f4af8d68f3820b6e6db07a91a01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous URLs pointing to compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The embedded URLs likely serve to redirect the user to a malicious site or download a secondary payload, aligning with the typical behavior of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://laborke.ru/uplcv?utm_term=procurement+and+supply+chain+management+jobs+in+uk PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/afc3cf39911dc18a4fa7fb9262e96657/kexodotivazuperafo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef556c171---vurabu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f508344577---kijadomagitaga.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s5e78rp3d9i1966nntcau6s8t5/lanavivosanegibos.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/99083982256.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gesojifutomejip.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/6977815018.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/rifela.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/70435494170.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5ba05d631298d9b8b05054fb0ccfd533/82399103962.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37bb398a5---diselijujuvaturewi.pdfIn PDF document text
    • http://erex.hu/upload/file/rurijubuwoxupuso.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f8467c9c06e---67858750650.pdfIn PDF document text
    • http://www.77ice.com/upload/files/38926389234.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a04f707946c4b221fe302a1d39b98f05/babawetifekagipaloxaf.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/kipoxuwavinuxiza.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/30983947096.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998f84baf9c---39028295990.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/73261055172.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/pagevezufawotowas.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/38478554434.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80187006898.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d0ca89f6945f8828f5b8576ce63a345e/26671110066.pdfIn PDF document text
    • http://biosite.ru/images/news/file/wixufisoxuvugeniza.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/a4a9d0jiu2q8c28t7mpr3p1egl/7197252496.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739613b2c26---vujupepev.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 11536 bytes
SHA-256: 7f59977f60beaa6f6e10017fc02850e5164d709de820915b1d8c6707133a5411
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 16096 bytes
SHA-256: 0fcb10f7d5db9be59fe8c2ed3097dfe9784bd1169561404dda2551b52b457286

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