Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb00c140b086cbb…

MALICIOUS

PDF

86.1 KB Created: 2021-08-25 06:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df8f537f4f7495b3e1da3fe2e080a50f SHA-1: b29d8910e41450239f41277056959114702c77bf SHA-256: 2bb00c140b086cbb64ae0a2923f23a84d3e03441fbcbc9c8c7e3f0107526d37f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://custom-mugs-factory.com/uploadfile/files/35409535176.pdf In PDF document text
    • http://gaziogluenerji.com/images_upload/files/98469899477.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/251118513367.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/zigumepavutiguvisomopotu.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/xegodojidub.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b06ca9212f46b5735aebe96fc841bb85/jugemefedapel.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/77165047174.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139cff2b7d2---jakupumunizutineditikal.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/oqtttom69nh8uc2nolhjhi7cq0/risoxeb.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/evopm69h9m0q0o6mf5ii4578sg/jumexokoxe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7a82a9a10---jetikolig.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd268806c52---88563757217.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/fedovabapes.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/batemareradupenex.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c992b79fa26---tefonasadola.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/16057771050.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/71893274136.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/20910983956.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/db2d07b8e5c506eb71ac049012a59499/96159981816.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/12748338286.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/64232850958.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/isl0ll38c3tnat52b033m6k3c6/13711224560.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/83dtp5h4slfr2hs0iun2esg66c/disuzijevikesebizixavul.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6c7c510e---3419691027.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xemizavotisalezerozowunu.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bdf81149005c00fe6e466991827660a8/lekakawik.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160beab9b86248---jobesijoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=position+time+graph+meaningPDF 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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16772 bytes
SHA-256: bc0d04ab88c02770d1501193407e22c20efa5d40725d3678bb4ec2d08697be46
font_01_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 10652 bytes
SHA-256: 4e6c04ed07a15db68febf5d943d8b96239ef221f4accef08500ccf5dc553acab
font_02_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1