Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4df1c05172267e…

MALICIOUS

PDF

83.9 KB Created: 2021-08-21 16:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9674ec0642b093fdb0c297e2f14919c0 SHA-1: 6956904b39f255b6b33a55e3ccd8d3e0c92555e5 SHA-256: dc4df1c05172267e8a70f9ecb76f022e85a5fe1ac3dfff7851dc3bd8d2abe988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/kci05mtgmc3pn8soug7ro88rqf/kuxinosodibasulexosazoz.pdf In PDF document text
    • http://patrick-vallot.com/upload/files/kidosejavogezawozuzij.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/gikatixijitonutufeperit.pdfIn PDF document text
    • https://medtek.vn/storage/file/jijawosavetoli.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/kabupoxikemo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f348a98d8c053d72eb771cd9a09238db/rowimoro.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/19589183957.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/67404326580.pdfIn PDF document text
    • http://texmet.pl/userimages/file/26874013642.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd0dee4281---zolanesevemadekidulopem.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54235af42---36101315679.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26044707637.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/vumidasav.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kugugazagolofepezu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df95837e7eb---jipotuxofidago.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0ce3e890e79be6bb68646b48fce07995/7947534877.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079d59888f45---jimojujubugafosilolew.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7c4ddbeae---burigabuxixujusegifo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/24f89efa4e9106c2ed467e6ea23f4f7b/97134119240.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/wunipabagemoluber.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/19e10a349b669b256df0e7a60abee433/28141309185.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/99b2bppvc72mchbuo5ur4e5e10/91795267392.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120214366043.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/notujopisuwurilav.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jebapopipipivuxuduzefuja.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/volerutonudeve.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/sozegirofefopar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kerem+ile+asl%C4%B1+hikayesi+kisacaPDF link annotation
    • 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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10416 bytes
SHA-256: 629f462cbd51d66020cd4fa0f627bcac50976bc36dfd8da7617a4566ec722b3f
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 18700 bytes
SHA-256: 9e2da92eb967121b9f111131a164dbc9409d95a96281cd1c70906f9a8bcbed1e