Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd81a6c30a9ba1ef…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 12:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d5180df61fbb8f6eebeae384d002034 SHA-1: 9a35b973ed45731b46e2d3743c4eed42012fe27b SHA-256: bd81a6c30a9ba1ef601bbc1f1aaccbd3cfcc17abbe3e321c4e84a0b9a017c97b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://shippingengineering.com/files/ckeditorothers/94275231191.pdf In PDF document text
    • https://vandolderskb.com/images/usr/33425528545.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/xufuvujadufojimirugekebot.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/45653331360.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/73156562232.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/40215207817.pdfIn PDF document text
    • http://land89.com/ckupload/files/77769455146.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/16065260327.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/44893254484.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rq5snr8e6if7btafjjiam6b58f/gelulifexopaki.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/pixitudugaruzu.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47320325678.pdfIn PDF document text
    • https://hobbypet.cz/files/file/rewamagefewi.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/webaxumeragebelovonegosap.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109150336441082.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/32659021075.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f356dc8eaa---sirafumuwiviter.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f2ff96b553ba29e7fc25d3684230c801/gideruzop.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/volemowu.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gukipifatuluwu.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zomidi.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/fonuval.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/46952744028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+pink+2016PDF 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_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 15836 bytes
SHA-256: c99bb1997f291182135142296d53e10006dafef06d5c253fa016279cb8f36b03
font_01_sfnt_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10452 bytes
SHA-256: 4dc15351da7916bbb88fa10e1b5de41eb7c14d4d5921dd10730f51f50414f9ff