Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f2c0ef4dacaf95…

MALICIOUS

PDF

138.0 KB Created: 2021-06-24 23:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2bfaf7a33b56ce99eab113a9a264e83 SHA-1: f54c5a9b5a887aa165ddc9c3e5ad36aec9cb4eb5 SHA-256: a3f2c0ef4dacaf9544fd43bf992b583fe2b5d0b5ecb494954cdf4d665bc67c66
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the redirection or payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=pokemon+xy+game+apk PDF link annotation
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f023f06512---30846348046.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608138262319a---vuvife.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/881bd64b0623a2fc2ff2f44844f51b6e/92961312023.pdfIn PDF document text
    • https://actor-conseil.com/files/file/26172925563.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf0a21b6f2---46593116523.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/24524808629.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/8ip542470shk84hkok2qttktll/62082301616.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a369e223806---pedodopativajerit.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vl5jfc52cn0mofbck37lf199ut/37888183301.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcf3987fc---janasoxo.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/975376a9edb523a54dc15a20294f8147/neforawulubikabunesijed.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/057edf6caee4fccdf93ddba245fcf4d5/63841617258.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160729fde14bf9---poxenewip.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6qbnrokue91kdrum3j6c96fhaj/49198654443.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1fe31e18857e7c3f88349d574199f763/lurozujigopawep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7E 53560 bytes
SHA-256: 8817b1881e68534dc88860108d8152d9531758f08fb85bc1b466d305e0e2d711
font_01_sfnt_off0001e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1B1 5068 bytes
SHA-256: cbb56f7bf2dfda11ffa811dd02cba542f3e5d31a4fa7abbe13ab6a6e89dc9d6b
font_02_sfnt_off0001f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2F6 12152 bytes
SHA-256: 6cd808bf34c7d9e70267b7eeaa0a5c839aa33c0343141fd8695b1202e9eadd0b