Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd296d5279e75c6b…

MALICIOUS

PDF

94.4 KB Created: 2021-07-01 11:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a63be7e66cc6bf886e76d7abbb488689 SHA-1: acc67dc9e978f95312226edabd18563e61d7d408 SHA-256: cd296d5279e75c6b46aacd0f9011c66baf1f552d773d8810ec455ac4974e3a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://queure.ru/uplcv?utm_term=chess+opening+e4+e5+nf3+nf6 PDF link annotation
    • https://campermagazine.tv/public/file/97507508887.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/51fc22cfb644f2cd1589d3aa681c0930/84458670513.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c041ccd14---53884837517.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/xogajuvigebefixekewo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1ab403df---fafakusowa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7167a03a---superu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/uofsu337v6bgkmc2chevi1o902/51589368247.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f95dbcf7---zezunomamabatawu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bd3c32ac600163ab31f232ab7a189127/7768896577.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b84f592b82---nirufepes.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cd07cdf4---zobizuzaxiwe.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vufaxafajelupigizevo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18601f09d2---dagesetimitiko.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d3357f2efbba096c226f93ff9e45f4ed/4107596540.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/jirup.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///9297509507.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/ruzuw.pdfIn PDF document text
    • http://jarosi.hu/files/file/laxuwofolijinokubosivu.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/qe6es6tcofrq50n2n4qlmvmqlf/jowadokesa.pdfIn PDF document text
    • http://placc.info/up_image/38271933276.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/tedevef.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rg0e19tdtokreensbqfo3qqko4/neseterovum.pdfIn PDF document text
    • http://indecomavo.pl/inc/87813801909.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ece7d5480---bamelote.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_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 18184 bytes
SHA-256: e9fef9e14b1a6a5ff6c9275c70929105962308e6b596f44041c08e8a67893e44
font_01_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 10816 bytes
SHA-256: 14cce87b0ba73df3d615caf8f0ec4c02c5143779d2e8cab5e4ce089db5b09dab
font_02_sfnt_off00014ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE7 1884 bytes
SHA-256: 1a02648605b077effbb842b083c66b0e466b44db270e1c986184627c8f77afd9
font_03_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1