Malicious PDF — malware analysis report

Static analysis result for SHA-256 420507ca70d7519a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 15:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80da4fd6c4d2ff22273c861af5bbb09f SHA-1: 5d6a6a49230bc0392cc6bd0ffec4ec4838b834d0 SHA-256: 420507ca70d7519a3c0088e3c001e39c5c54954512727b06e4a010b68cc24ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=how+to+take+multiple+pictures+on+snapchat PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b86bf80f---24230340224.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/paduduwewoxuforamis.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wuwuwifegudoja.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0847156b---32504691448.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2e9f1b9b---2049984258.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/35280580310.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/20fe5c8e139f7c364b963e24b8e3727a/puligive.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/59221765550.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea3861c79---vipepovokaxipukefub.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/kutovegukibefoguwisunared.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/60212403137.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/82902616365.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/nanusis.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65c891cf0---25237674964.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/1144702589.pdfIn PDF document text
    • http://email-database.info/userfiles/file/97187732833.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/13029503439.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rfgjbihjj1uqgjd17cej3ku6u4/jixikorugefopogaxe.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f808476497---92188537063.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/20098793326.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c3f704dfb75107ed78ac65e1e1d7df03/14015047500.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d3925580---sazulujomurotazan.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/3361783411.pdfIn PDF document text
    • http://cga82.com/admin/File/33543401557.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 17516 bytes
SHA-256: f51dbdadea952ad9545a7c7fa3203e9b1467cfcf9b3565b5b24f3fc4f8afc72b
font_01_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 10908 bytes
SHA-256: d5068008a90e689f76c7b08df7ba7021546bf9f7b43da18b57039dd4a673b280
font_02_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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