Malicious PDF — malware analysis report

Static analysis result for SHA-256 075af4ce8ef69cb5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 16:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e002f1af45b12eff8fdececb6eab834f SHA-1: d6a7a99b73ded7f149350cea27b4555d26d1de48 SHA-256: 075af4ce8ef69cb53fc48b809255215547e0a018ad305c5c096ec61bcb475ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://helloslow.com/data/userfiles/files/53120817493.pdf In PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/97645976614.pdfIn PDF document text
    • https://blogsma.com/files/95942441245.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138079251b9b---wubabatokokigoko.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vuduxutakisojufadulamo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4ef279d90562182b4d6e07b27bdfb8d4/jomebixurexesofe.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/62178252214.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/469741189.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/2243716179.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/fobibede.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/tuwasokexufotexugepug.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/80788548997.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/sisibutogep.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fapirokulopomakudova.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/kolelajatifixinoguki.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/jekanasazom.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4782dc81---mebitezuwiwelapim.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/saposiseralovidegezoj.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/dotivot.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/viwakozixem.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/sixemoxubagadapoxevexa.pdfIn PDF document text
    • http://fullx.net/files/sejipepiwepigapotobexijov.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/zalarulozususo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece85970b7---72651581968.pdfIn PDF document text
    • http://hnspkjx.com/d/files/86227072633.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/63702986117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=video+chat+with+friends+appPDF 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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 17588 bytes
SHA-256: a4cfb913a5eef9debc8e9013bdaf2626a74c7fe44142b4c4a876de20ce1006e8
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10724 bytes
SHA-256: e5b535baf5d96d99a3acae1b52e1b6632dcb7377aee6dcfe0ce5363e4f9b10a2
font_02_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1