Malicious PDF — malware analysis report

Static analysis result for SHA-256 7776f3d9803367ec…

MALICIOUS

PDF

84.4 KB Created: 2021-08-23 16:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f3f2c231486c8d3d37526d6f628b2d3 SHA-1: b0436875734590b3b34f8bdebfd882c0de07f7d1 SHA-256: 7776f3d9803367eca63aff3c7a456bf39a69e89182eac50d84b03ba5e9088a7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=four+shipping+markets+pdf PDF link annotation
    • https://bahia-group.com/ckfinder/userfiles/files/1699793822.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c4ko5kogjlqn1rpuv12d7iqqtc/kefokunesijawisujatevis.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/tivuf.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87fd897cb---pidapefezojoz.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/92748588601.pdfIn PDF document text
    • http://beateromer.com/bilder/file/6582983160.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a858173f0d1---nowuzejoxoniwakile.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/zajazowidudixuxegoke.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/20571786292.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6c6e18e27a82e43b1af0fdd5a9a36ecf/kuwijulisakamitubega.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/pesabelapojazuk.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/37748428781.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d0faeec86efd70eb06d101c3cada2f88/79045271915.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/momofe.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/76704755146.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/boxetesesas.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wewuze.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/zazivogopa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608466d0452a2---81567280197.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/vagevuremebebaxera.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jbbhao0hki87tv341ggooqnr1/60298405550.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/62263742358.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/42760782444.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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 11068 bytes
SHA-256: 6933572147510c38672f1e32ca51de160e5d388128dea5cde50d218da8c11442
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 16696 bytes
SHA-256: f705e6aecf14ff53d7c88cf9c52c52ed6c75dea2165e9df0bd97f7ba5478bd76
font_02_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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