Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b6292a1cdb6599…

MALICIOUS

PDF

77.8 KB Created: 2021-06-12 09:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45387b5561dd8fd4c2b247a38b54fad6 SHA-1: a52621bfa6bb781683703f87fe7b35ef031aa546 SHA-256: c3b6292a1cdb65993136fc59ee9f7cd4ecf2a942c95e8b50282524232b102bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, disguised with lures like 'Tamil dubbed new hollywood movies'. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=tamil+dubbed+new+hollywood+movies PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38346214e---9710453661.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/43fc877740d85f500bad4bace4089bef/tetujejovorikixidet.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729b6027c1c---62245981189.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b714d2fad3---boditinubigemarixiwirug.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ohids53bdn30g0kgddfam9rjmf/87477182515.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c20ca51bc1230611b659d3b4676a93b8/35299575128.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b1a00b4a2f88b8258deaa95cc6ba4282/fexotajiluvorisifibujab.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18caec4f5f---nigegovaberumez.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/s8v3p85a961l9dohe3cs98haut/39211558421.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fb06371e064adcb976c21d4929d02758/16103792223.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c6cbadd9096de874f90c2e3094f2764b/52687500432.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901132d1421---5341987017.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5e66dd7e0c9ef8c672647b921bdcbbff/bozovufonevifel.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160783bb67d67a---rikakadisenulopobunegat.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/90751604504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 5312 bytes
SHA-256: 2fcc8b0cd5a44796042bc41705f6a15ef736ba002a72ffaa9ae16bb201a981dc
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 7844 bytes
SHA-256: e8129aeb173c6e7e74788273d727153fd973a0a1927f12c4f4c57f387a2a9da0
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10756 bytes
SHA-256: fe541e6ebabe0ff91a4b3536fc8d032177b08a5854fb13535cb0450eee371522

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