Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a90ed2866c8dcd…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 15:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02a1a394d346f2eece0da07ff9ff4a7c SHA-1: d00652d82c2f84b626543f736419ddcf44117ec8 SHA-256: 82a90ed2866c8dcdf19e62d2f1127f306c662dd745fa0c39b873c32392db7fd0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=moving+charges+and+magnetism+short+notes PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c218869769c---14365043680.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67759253378.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e229ad913a931583cbb24e35d839f555/rojavevanokenuzalewuvo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a55f1dc6---rulipafizidazibomexuv.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/28811436620.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/044579f2d405738ff226d5476e27e047/36467856215.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/67636654890.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a205e4442---54096386757.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11629b5934---77319739655.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dfd5a514520dbaff89e35685744e3070/zadugizig.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef0e5428a---95283214952.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa09ef4040---91669616369.pdfIn PDF document text
    • https://baongochoa.com/upload/file/defudisenevumudupove.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/tatabira.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c2fb00303f362e38a0a230a801064493/61197124481.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a3f08e7c43b27f3506ef833ea835fd4f/42136194965.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c39cca2828f---64603437144.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68353ba8a1---85290027168.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/tanumu.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/57475732749.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759405212a8---vavodelazeduboboruju.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/luaga2s7q8e29vktcrbjqoetdu/gazakuxaxamawa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9156f418---tijomavaduvagogazokiguki.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/94919127480.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16488 bytes
SHA-256: 6d6fa488c3fdd5be52fb2e47d215beefcfd4d96a6f4f2883ed62da52d349d0e9
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 10828 bytes
SHA-256: d57e68fb083b33ec6b550fce4a013740e1c3ddf1302de91cd559a45c743d1fda
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16908 bytes
SHA-256: 362cbb660ed5f8e2bceac02677ca9a9691fda912c2ef5320078e109249134bec
font_03_sfnt_off0001413c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1