Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab56369c7a816fa6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 07:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b75bc6787460058b6ab86e6f329c9d87 SHA-1: d10e19f344d564786e05c584b089cb45bc2b5b19 SHA-256: ab56369c7a816fa66c4edc1aa10b6d1c4182eca41e9b1d4c08d22b589e9c5117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://medvor.ru/uplcv?utm_term=2+letter+r+words PDF link annotation
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/50813162834.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/14235334707.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/dugutozok.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/57044460817.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613460fd466a2---60007646209.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xisag.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5485e0ba03dbbcef4cd73667f9aad011/dizopogijaniresuzutak.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475f7601122---zuvokijawe.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/totewabaletiboruxajilopop.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/tuxexusivirilixutuweno.pdfIn PDF document text
    • https://oasis-travel.ro/files/39825768005.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p41qds10ep6ivagg2aoiqigdm2/wamesitaxozozu.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/venodefamud.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/3745571964.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/kuvatuzanivejuzi.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6eb6eae5a4296cf01b0f3778fababb07/59197936917.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/32612646792.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161483198e3dad---9848284005.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/wagewifosixazi.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/76979529006.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/dewobotatisugi.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gabagezobigidibix.pdfIn PDF document text
    • http://redactron.com/userfiles/file/fevorofakabipunor.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/vizarasomevukaj.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/pozofu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1cb05ad3f---12300215668.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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 9992 bytes
SHA-256: b946019bb53bdacbf138919ee3a1131d8cd21b72240b08fe07ce4141ae372ae1
font_01_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 14648 bytes
SHA-256: 01bb28f54f14499c3abdc17dc14547a086c463c1ad4bd930527db8c0c5a00afd
font_02_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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