Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4e203b95ff2bd7…

MALICIOUS

PDF

86.1 KB Created: 2021-08-24 13:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed6d77e68d05e8c3ae6634f94fd46f31 SHA-1: c73294e1836a98313cc4ec0461aa62dbad2afc2f SHA-256: 7d4e203b95ff2bd79b5b297d430bb149f5ad67f49cd884bc52ba6f4ded130161
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, designed to redirect users to phishing or malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a container for the malicious links rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=question+answer+of+chapter+1+of+history+of+class+9 PDF link annotation
    • http://aire-limpio.com/img/editor/file/3603243928.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/41fdad527d46e601ef8514517772db2d/mexikelabovabenag.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099bfd9e65d0---wedutizujal.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d113c81ec5d4f946642a2103f5da20ba/67267889058.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/85692679691.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/48373060185.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098529263488---52477774900.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/42722976321.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4d7e74d4---62169841397.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9abaafc9a623bf24015956cacfef2fb4/12386090748.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a7650f3b---jazelilelisakumixenobepi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6770359b4a591c83ad22797c8b1f10e4/83888302498.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edeaa9bae---62325105689.pdfIn PDF document text
    • http://dzbnf.com/upload/file///69796433253.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/3604bb67ee37737aa49acf180a4b064b/todin.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/fopiwuxokolizirefu.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/59514518089.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/9202470301.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c08faaa11bc2bddc4391d1337479c381/tedifusizosatina.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/depilezine.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a416dc6886b---welirobasexo.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/timokesel.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/90957475048.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/947b953c7e63919f232be3e77bca8923/dedij.pdfIn PDF document text
    • http://kme-kme.cz/files/file/55823287583.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16828 bytes
SHA-256: 223516a1a170a08d99638df3a381fbfd7604d3716966d64af362e31880f3e8a8
font_01_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 11156 bytes
SHA-256: 75e033a1505f66bb1feb466fa2d9079756891efb0bce02ea8b37affbfa0f1fb4

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