Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61d60a946f3e082…

MALICIOUS

PDF

83.2 KB Created: 2021-06-11 13:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bdb83dfabf2df907350647d25b608dbd SHA-1: e17b4d39afa7a8f2ec0a1d051554fd6d4059f78e SHA-256: d61d60a946f3e08272f087a2fe48de738ba4bc12b0228749a821bdc47597016b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=iptv+stalker+player+pro+apk+cracked PDF link annotation
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/cqr5bb1a0fi2h5n3i2ae1dsodd/sadovivezuwogogakud.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/31156203776.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/a5d066d5454c255cccba7a15815c7193/vemonixarotevejal.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/gezudav.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/39852945801.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c826366a0---xivakokibavokug.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/dexefutajuzulesozadut.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fg910ovj5q9d1mt0rvgg5kcf51/95211782962.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021060500220381.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mqeobg83foi8lovng1rbocsfc/40057058681.pdfIn PDF document text
    • https://semut73.com/contents//files/86786776218.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xuvifagoregajoradex.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a902db1acb---dapixikozomizopifep.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106101412546721.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/14006431413.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/240151012981.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/20375081053.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3219c53be3---32888025753.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/491ca7e2bbdd608d0e5e8d59a11d7c1f/nuzujede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 4864 bytes
SHA-256: d3aecf6906cd7afba11b0b66aa185131e912b6bda842bb4ed2011081a9ac2561
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10832 bytes
SHA-256: d5ce8c712622fa4c5bf9b1b8f6cda36786c0fec7a24f31e47ee84f257f9f0cd5
font_03_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 16956 bytes
SHA-256: 89b86d1ae899296861a1414efce80e39104ea85ef3268a3ce7b24c2f3cec0223
font_04_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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