Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c859feae50a181…

MALICIOUS

PDF

88.2 KB Created: 2021-07-30 15:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d56a7ac47561bd079a31c522d4a214b1 SHA-1: 7f382f5426e4484a8588941445c1c24288525a3f SHA-256: 73c859feae50a1818d0c5de9d610d1771e14d3450595bdac70dfe4ea6f82bf3c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the link farm and SEO manipulation aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=how+to+pair+plantronics+voyager+legend+to+iphone+7 PDF link annotation
    • https://evergreencans.com/userfiles/file/33646467271.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/93026064991.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/bumij.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/sazavosuzox.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/11828597128.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/upem0s4agksosncijq0lon5p6t/39425163513.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16070e76fd176a---56212037658.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/95797618770.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8857a3f01e66942262b80fd8ecba336a/lafenuteduxoratewedodoj.pdfIn PDF document text
    • https://suksesunited.com/contents//files/26564072757.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712735f2d2---93118525680.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6265320271---vukewi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/sifegejimozib.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/nosasumixe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1t5s27k53t22t9aur6gh9cbapf/65313080371.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bdb2e536---6079539710.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210607105712.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a453daf639339463b9fcf8309afd9e03/lunev.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/66ea92993054285c83280332075dc7ea/demudavojofudabajazisa.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c008b554d---19869472104.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1obt0bvlkjdc47376l8ceaj32p/tofoxixu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b5636492f138986a7c913f192361710e/92979303870.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/rabetakimusew.pdfIn PDF document text
    • https://jetaime-shop.com/files/zuxemikunajix.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 17624 bytes
SHA-256: fcfa09af6856f9cca81a4e3720d6281d136addfcc5bde0b11d196b1f8b576388
font_01_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 11100 bytes
SHA-256: 30187dcb32850e91b2aa96be97408c0aa5142f6f5f55bf46434f88f729c22dff

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