Malicious PDF — malware analysis report

Static analysis result for SHA-256 de61bea9b7319781…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 15:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3741ff957f516bc8bafa89615f716030 SHA-1: 1d99f44a99475c57cdb713dbf4162cb2f4c66753 SHA-256: de61bea9b7319781874dab2532d6595272d815577967adc12667d1d5322f9e48
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=america%27s+cup+2020
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b5c42387---64758214679.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d7ab09c8517262f9f859ebe11bd6921d/676535909.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d52f53922---xenevix.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ae67be76---jifokokorar.pdf
    • http://bitite.lv/media/txt/122/file/pisabizonulujopavanini.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/i5jci1rndgdo1jo4l5cqsbhp8t/zumafanodidudoku.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64b48bfe3---jepajimedin.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608df625ba491---84356345679.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/gugavitepexemupafege.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/64jmnohgq9pogqas7a18gmdn14/14083838407.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b164921ae8b02731ca8ae65feb9fb38d/riduzovozununavefataju.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d997e4c914c6fd42bcc5f2f0d19eb25f/xonopafilelovajajemokod.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/wozikolovugor.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd41c140f---xilijebunixoniluze.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609467b5e951d---fabud.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35884f5fb---lodisupamenexomekomexejix.pdf
    • https://tsegypt.com/file/nubor.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/388f8811cdf524132c22c0ada0bb730f/40204900529.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ec4ae181cc08e306610d10efa5a85558/19374434712.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a35f11d5---40707578733.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8b774645---duwudifasor.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9848601cc1d325bef7fc673ebadfbca1/bomameb.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/048b0mka98f8l0qo9mh59l402u/23118473096.pdf
    • http://adamlegal.com/userfiles/file/11561346782.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16792 bytes
font_01_sfnt_off000104dc.bin
86536777d6aa33e513d149da096670c86b7b041d361d1b65fb19dc53071ce5f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 17684 bytes
font_02_sfnt_off000132d7.bin
9b04fac6ac5bc585c4d1e460f1b19b9461edc3c3d68fe34ec2193b1ee947e223
pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 10524 bytes