Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ec3a4aabdd0102…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbb57b9235032eb37526490fbf9f4110 SHA-1: 89dad0e7f37da0940822bd3452dc612cb3540633 SHA-256: d6ec3a4aabdd0102ef00728e229792dbb2a0c2d34449384ee1baca07ff59cb39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and a link farm on disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=how+to+control+android+tv+remotely PDF link annotation
    • https://dodatnagarancija.com/userfiles/file/20745279664.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mojejewonodagevexowavaj.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1d394f5---23244717509.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/50418716923.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/76913562832.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/wukazi.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/74150938297.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/pomewuxenu.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/70486263677.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/jofeno.pdfIn PDF document text
    • http://fkhd.cz/data/img/vulubuwulikuwiv.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/55194763673.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/1423274430.pdfIn PDF document text
    • http://tdbm.vn/upload/files/vogagizu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613043dc2238e---3539875065.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/mimovefowasifexopimafer.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/kufaxitadenu.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/jaridovetofufos.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161354d58cfec4---29468264301.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/nolunebejubaxowofexefon.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/redebamamixarukilu.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/11698601662.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/berosupesujisira.pdfIn PDF document text
    • http://recrute.fr/files/files/rozipunapogomesose.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/47441578285.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_off0000ba7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7F 16148 bytes
SHA-256: d9302ebfadd1eab10b10efd4243cb0919dfe4e40865f8883d2ff17785cec2c26
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10620 bytes
SHA-256: 2bf9a7ecc58e65f60a870866ccd11d6c42571a7300f5c56497e2a63ade580f0c

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