Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb6dc37a38a4879…

MALICIOUS

PDF

94.8 KB Created: 2021-07-21 09:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92e4766ac98a58356a1636ba7a6b8cfb SHA-1: 194cea86d9cd476a810907ab2b214198d075f64f SHA-256: 1bb6dc37a38a4879430faa36509117db0d9d30d831de0c4539199035fe78c2a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1e13f8f7---83151218797.pdf In PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/86329223364.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b2e58cc32---98601623266.pdfIn PDF document text
    • http://www.celso.org/download/43777265307.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/16215021884.pdfIn PDF document text
    • http://brlairport.com/images/file/wabupupupasojaxeponamifav.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e3450810a44---fisinexenifoporotu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/538f2fa550d20464335f374a2bb08bee/1523658866.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7a86a91a---26737272570.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/83129380a69217bbec8bc32ffa1d7737/sawonobadivu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bcaaa0b0b---40077635212.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2dnj0ftf900smv2aqre4uo0k26/35270149809.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062107260773499.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/n8h6p8ut42f6qvptm05pa9ar6r/denikavugufeginar.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/57780393877.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7p9ljhgupqpt2bp93n4id73r86/natel.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/sibugevovasopafizit.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4pf69va3g6rom6ru84aegnltcu/savelinenetirazorezoxub.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/48860983678.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xesularipuzi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2740df656---11491757893.pdfIn PDF document text
    • http://abnicum.com/files/file/lofadekepobewifoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=list+of+canon+star+wars+booksPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10424 bytes
SHA-256: faa36b95727cc74fae3f66b06391419da803611ee0285f3af17c78bb651478ed
font_01_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 17748 bytes
SHA-256: 5cff4eb72e1803ff35cd74309dedbfdeba977243b56bda3a9b05b25c8fd07563
font_02_sfnt_off00013f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001573a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573A 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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