Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8eb4d8ce784b3…

MALICIOUS

PDF

92.3 KB Created: 2021-08-12 20:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b28d43dd15d84f50d68c8f3f5d83d10c SHA-1: 0a1d5188e0308515cb7763eb80df4b684c8da911 SHA-256: 8ff8eb4d8ce784b36a2e18aa0fc1ae934298dbe4eaf628477eaa899ad98286b2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a phishing or drive-by download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=aged+care+job+interview+question+and+answer PDF link annotation
    • http://winfielddeli.com/ckfinder/userfiles/files/36991354867.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/funizetin.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/31567156928.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f01cc0fa9f7a8153c02625c586970c49/jozox.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/73209876662.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b82bf87b---melini.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/79536652241.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ca765719---35118674590.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7bp69g0uv1m6igqhfu7chdbv1a/82710046807.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/pojademuxunupupa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qbtphhm5lb41pgb93jvpjedpl8/34605438691.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e50c23c8ce93538ad9dc6226aab4fe49/51571240056.pdfIn PDF document text
    • http://sport-way.ru/img/file/74411464655.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a1b239dc---47656304089.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/65921889255.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7012de17d498cc993d5d57bbc1f259ef/zevetip.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c8a84bb1---zuwukukixuboxekife.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7bbcacad---23629953273.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611421a6a8e79---25334722305.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/21829781213.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/73433300827.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4077c5ca27f510985f6ea751e1845b9/33612128183.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/guxaposeranumaxukixotam.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/lolejesorulate.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29f594cbdbb142d986c5dd1496f05cbd/jubiwexesabokipivojetab.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_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 11148 bytes
SHA-256: f5c7d1974c1c81f8ca3f65981b6bff6b67d41a344db63aa0b04b419997b33b68
font_01_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16628 bytes
SHA-256: ff985cd00e3b8d541f708af5a29cadaf6736d463dddaf7778db72ffa01693bfd
font_02_sfnt_off000149cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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