Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d0b248ec128de3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-06 15:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c2a2ab09565c4fc10f45af6d90bfcc3 SHA-1: c5b2e82412559ecedaa4f564da3e81b546afb8e7 SHA-256: 50d0b248ec128de3826ce80445f8016b3e914c63d6835d8b172712c33462e738
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, likely to deceive search engines and users. The ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=naisargik+apatti+marathi+mahiti+pdf PDF link annotation
    • https://menu2uplus.com/images/file/87105584867.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b4ibc991489ggq429c0hf72g6/tedaramixa.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pisedinoneru.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076020bcf6a0---69685486873.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/miboketa.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108142048251175.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807c10f2f6---88521964874.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/tebezefugere.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/kawixulinutuxijed.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/26031677320.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/46163776928.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/98265421667.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b70981514f18afa8fe1d654d7555c1a6/93160305708.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/78816070221.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810236a9368---tapukujadutulotezuka.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sca3kgnsrii1ei4c9unq9hp9m2/59065713170.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/riteridaxelekarubaduso.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/40621662388.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607933e4c774f---rukusin.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/59173138734.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210902021046.pdfIn PDF document text
    • http://gtshotel.it/images/file/28329535151.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tukagudopulasepavupenu.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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 15384 bytes
SHA-256: 1e4fc83e791caadec3055f4dc57e06852a58f7628e024401c43808fe2b4ec0f0
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10612 bytes
SHA-256: fc7698640e219b8715954fe5f5ecd19a819000feb88e0e7052f67aacf5d6797d