Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7b9a28eac46f33…

MALICIOUS

PDF

96.4 KB Created: 2021-09-08 10:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41d7e83c42be56d9e5b37538f1c0ea8e SHA-1: 80eb3e5d6a7103330d267f079cc03e85c0b18fce SHA-256: 1c7b9a28eac46f330639d11c8612227546a985e66a65b2f95fdc6db97399d493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of the PDF reader or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://seidels-mineralienwelt.de/images/uploaded/file/pupatek.pdf In PDF document text
    • http://kapli74.ru/upload_picture/gafeboguka.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/3816615142.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/iejtr27t9i4ihfj10kiq4sgnn7/48699873700.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6c35b697e4356149a05f990a436a40fa/76744895352.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/sujaporazuzes.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/11211320153.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/pesatalemepakutuneboziv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40eb1acea---xuboloxeribobekaf.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/keled.pdfIn PDF document text
    • https://paperland.bg/uploads/file/noxuba.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jutulasemomexuno.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8c23df95---13417711479.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/23648459139.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4716772116ee487eb99dc91b59daffc0/36788021803.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/nudubegaxiluvexubufod.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe554a6182---76422109141.pdfIn PDF document text
    • https://vleek.com/uploads/files/5867991640.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/wafobubedi.pdfIn PDF document text
    • http://yulintimber.cn/d/files/zufumonadovixonigonur.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/fegojede.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kexafizoxadosebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=l%27urbanisme+pour+les+nuls+pdfPDF link annotation
    • 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_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 21500 bytes
SHA-256: d1bd40bfcb3e838ddbddca95cc5abcb5f5b747f2ecdb05334cd07581c91763b3
font_01_sfnt_off000143c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDF 10792 bytes
SHA-256: 4cc0719cb0ee1b5629161ad26349cc6d4cddb30685954b7bfe49624af3297eb4