Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc1aa8d645a089…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 07:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61fa30a836df7a7bd9b8b0bce47601f5 SHA-1: a6fa8652ff2e1dabf03e494f6ce138bce5f28467 SHA-256: 25bc1aa8d645a0896598c4051e5916e7aa1efa97db0428fbe54a31c53ab91f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the attack pattern of using a deceptive document to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=florida+rental+application+form+pdf PDF link annotation
    • http://tingyi-bnb.com/CKEdit/upload/files/taverasubeno.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/64098372976.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/27110187340.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/48454864724.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d2f59a09b1b66f7a423d9b6264dc502d/37412798439.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/77835074082.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210804_D13E4FA39BE03488.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1fidljo0n4h7tu6l49qb7bfi31/13774849471.pdfIn PDF document text
    • http://stevis.cz/files/file/723840712.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dc99976c4---wudevoxejegukan.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2b62e4a1---99958936766.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/kisut.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6b49b1b5---juxol.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/ruvudaz.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/84191189801.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/gajomoxigefogexubisape.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/67224765973.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/sekotibipudakudigama.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/79734499903.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2ficko2rm6m426qhek6j5qv63o/davitanizego.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/23860697685.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a4f737a0---55442828790.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/54391108614.pdfIn PDF document text
    • 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 10592 bytes
SHA-256: 794d7228df97c2dced114928094257740cb9f7addc75edd2f5c981608af7c3e4
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 17444 bytes
SHA-256: 4931cdb9c2ec377b40857dfd596140e6804acb098567784b6eca300c7c53365e
font_02_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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