Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8159e3e8284d49…

MALICIOUS

PDF

178.8 KB Created: 2021-07-26 14:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 208f18314567d7affdbd9d6e7d9e4360 SHA-1: fd5c032fde4e32bef0470437f90abb1da44ab801 SHA-256: 2f8159e3e8284d494ea772f167ddf36f942dd2ae375d0c59d173941eec162c21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c424b3d60---sumisanevomezal.pdf In PDF document text
    • http://komputerzagrosze.pl/userfiles/file/lofapunabumebopirir.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/bezuwup.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42bb10ad9---62384828719.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/noziwabed.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6ed487c---kebovunabisagadiwurabi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609849beb9632---5916142821.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fubonenemode.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/besuzefakejajimomoka.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608650cb4d6f4---36746667071.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/divigenuvavuwejexigolap.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a96835a5359---54152664141.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/gagaw.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jjd61lq999cacao2v7ich4moou/pakodamolazoweluramu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/73428f6f9c6d7f419e5a22e015813f89/tepelepopowusimezu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/904b849bfc18995c38e27c4ba2bf5add/11302859441.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/eg8tpbfsu9d92alrf9oosaf7c3/sadopifopuvifokipiwog.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f59c48000d5cbf48d9f951ea7eef1b26/86421142364.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/397770d9c35611c2a0ad2d05f684f523/nevugagaxat.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/fivomerekilut.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/dozoremibukevinefurokeke.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38c3e4bb1---1827840726.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608770fd717bf---54268642922.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f2e1d1eedf3f8974ff330909645f1a19/davinezetipubowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+off+narrator+on+minecraft+ps4PDF 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_off000258c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258C4 10852 bytes
SHA-256: 592d5c8fc443015541a1c0b3624711d71d1c2f9c9765aaa98248c42b7fbb07b3
font_01_sfnt_off000271e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271E3 19428 bytes
SHA-256: 15afee6a92cf59ac6c52f7b7926593bc687693dfc9578d244a63d546f18e8687
font_02_sfnt_off0002a513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1