Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9864beb3f862514…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 10:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa502b50d8212847fedc8d21f267ac48 SHA-1: 9f2ff5985b2a3582a799684b1a75e0ab2c2e38b3 SHA-256: d9864beb3f862514f5cecb402a0392c5ad8d1d43d7afb02bf1a2ce4fd088aeda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users through these links.

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://allytemp.ru/uplcv?utm_term=fifty+shades+of+grey+full+movie+online+fmovies PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d9ee9409---xesinitete.pdfIn PDF document text
    • http://praguetransfer.com/files/file/61034143529.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fefifizon.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vesoxejugagofesuwojaleba.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/suzigukuxupupumefagulak.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db21950a69---91914535961.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613daaff8e595---58525578243.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9b7352f491eb937821255a70c0fb84fd/navexaxopakinen.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fa794093c09f73f30159a0d30b274874/27397634862.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/11531958913.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/81429696097.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/pumigefi.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/tidazamotixokufi.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/99987433930.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/reraxapudixuzalufedepaga.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wadiwogogeteworebotuwobof.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/15872718310.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/50843140183.pdfIn PDF document text
    • http://asvpp.fr/pdf/35001341434.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/25823707499.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/bozenixa.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/nufojomoserudikozapibuj.pdfIn PDF document text
    • http://elpijisystem.com/file/67502215549.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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 17888 bytes
SHA-256: 50f27c8a72c70551b8347a916a1e0df2a00ac95e689d461a01c3148009774883
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 11060 bytes
SHA-256: 934a87318a8c73174ca66386803e634338d7f6ff5b423b74d8f264f9e4b51d94
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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