Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc33b378f0605b18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 04:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9813d2fc8ab7a9a779a914607d9a74f SHA-1: 3ebbc557aa9b08f5dc2bce23e194c9550487f5f6 SHA-256: fc33b378f0605b1807c555efd95fb0cdca7643313138e54ce650ab8ee77209fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6c02b5067be5595ff974a37118facfc0/95176676533.pdf In PDF document text
    • https://dobre-akce.cz/media/files/file/nipuvilikosenanumujavu.pdfIn PDF document text
    • https://fivetc.net/uploads/files/dugidomut.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/17563857376.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/dimavonoxaziduje.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/buzaxakudez.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/22120560734.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/450qedq5i4sug772d2m1sps5i2/soranikofesozunigixizu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/4660141823.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50592e985---75389496646.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/40711546584.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/96917903980.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/14477043200.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/refimovobogodi.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pamewodibobaserejudapos.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/31481592308.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/nevinezagakiwuz.pdfIn PDF document text
    • http://signauction.net/userfiles/file/miwor.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/pexikigor.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/dogixamebowabetitebopakuk.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/49814333269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=developer+options+demo+modePDF 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 18824 bytes
SHA-256: ede483cf897263b726dade2afa78b5f625e87ad67fb7732b82e756d7318481f1
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 10456 bytes
SHA-256: 2de9a678db0c3dfd4558f7ce4c2a66875d402c1c2ddf599325135f9442a2052d