Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b1100d8e414eb0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 02:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14f5a90a408830c66ca91ac1a498e4a5 SHA-1: 6464c6108ec183ab65f41fe2e47bb9f1ea1ee59e SHA-256: 35b1100d8e414eb0d7e4e8175c809bbb90b6c362d92d869955af94764038281a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple URLs, including those hosted on compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=transfer+music+from+android+to+pc PDF link annotation
    • https://akilanews.com/ckfinder/userfiles/files/4810464412.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/21635286327.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/mibodutapopobaxerenid.pdfIn PDF document text
    • http://pasted-radio.de/web/files/rinitonaxulilos.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/besoguwonos.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/27809766388.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/dovanunitum.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161346e08e3836---guverisofojibatorupe.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/burutegibubediji.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/12613216949.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/39690657662.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daca47cb96---45406865270.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/popesodad.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410efa7d691---pegujerefikosu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/54152822944.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210918082144.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/dawekotubiwis.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/88887628406.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/begozipevirunusanupi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365eb41509d---84701076614.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/24501421393.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/85343155646.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f41e63baba6e994a1b4d1dfbd82c1878/84777333778.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/nowolezasipuk.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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 17440 bytes
SHA-256: dd949d821ff35caf78a5d196d8138de9576332025df43e268eaa5594db952b5a
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 10796 bytes
SHA-256: 0c879990928deae280fae4baf0fd44d9b57c9ce4aee04cc9485735c67b33cd9b
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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