Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76fd1f41e8b7cea…

MALICIOUS

PDF

77.7 KB Created: 2021-07-03 15:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dee58deda7843d1347ffb6439b3572ec SHA-1: 131f95c02742beec196ab607e9a2edb29962a9ae SHA-256: e76fd1f41e8b7cea6de1af118cd594b55fc4dac2c66b64fb02c374777d3d0018
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=physical+chemistry+atkins+6th+edition+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ea17a64a---33995504264.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s0cqfv65amslv91aiaemqenj2a/44770952307.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/10706507433.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ab56a47f182f5f3b04661614debadaa1/jojedifosax.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/97194670020.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/25227484912.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/61ef0887c867c0e44ff9f55defe7b21f/16205113933.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gipixogijisevedulozil.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/ruzumojaw.pdfIn PDF document text
    • https://cargobull.cz/res/file/buwadasofumubofinet.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9230e1d0---95515141528.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bgu0a235tab54p7noaqnnqagj7/vexogo.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/31287757031.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bebb0680a5---36151246216.pdfIn PDF document text
    • https://latework.cz/soubory/40580919991.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088825d017b0---fewoxunubisokato.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185f993cd5---9944282530.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69394411947.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071d3c067d1a---novumoj.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/201db1f8ddaafebe79f598e45105db80/defatefig.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6339f1a234eb3c835328a9c18548b8e7/73509128816.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcd895e07---ludapogitobafetag.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee486ef65---74351776323.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c818523b7d---45667177923.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5jjl6beph84m17cah4cqab3gm2/sutobugixukimofogowerikij.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a830f8c1---57113695081.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/m8so71nh9alpncarovk4c66k81/82760317605.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_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 11260 bytes
SHA-256: ced60a2c0e771957e050786d5e8bcc5f5208930cf5566cc5502312b027c9cfd6
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16472 bytes
SHA-256: aee96c21924e0e36dc2e7252d9c61d3e2748b71a5069edd11704542b82def25d
font_02_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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