Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ecdb997c6e4e42…

MALICIOUS

PDF

82.0 KB Created: 2021-08-23 10:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f1050065917ce9bc0d0a4a0ae2181bd SHA-1: 9804861ea42c086bc14fca22c9eb7a96c4e0f24a SHA-256: f5ecdb997c6e4e42724939f05f0e19341d3e6f2b92291e99038eda4a334acb56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://smidgel.ru/uplcv?utm_term=library+research+assignment+pdf PDF link annotation
    • https://vmwarts.com/ecovic/file/63391588733.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/16368067468.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed4474c25---58140433222.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/diwemesa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0670ce9040---66388882152.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5a0693200f646ae1dc65f50d5f1a0ef0/sililovugokifogesa.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pinexowav.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/zetapivefitubo.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/41322345463.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/69050902207.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3e7b61d5---sibasibujanasodezimewako.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/50078297748.pdfIn PDF document text
    • http://tai-group.com/upload/files/2510812647.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/gitezovudetobu.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/13030206351.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpebm0mjgj4j2voc30ela0dpi5/50570553994.pdfIn PDF document text
    • http://strahyi.ru/images/file/pubegif.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/403c11e2b3090fc03b089808d4a457e2/tatoxuwipolokarakoridevi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/bebixipi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/mutufusomapefogovi.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///37127291834.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/silutebovoruxu.pdfIn PDF document text
    • http://toonesk.com/upload/lugotefoxux.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4d02284a259ece1417478a7ef14ed3d5/mopifosorevegiwek.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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 11112 bytes
SHA-256: 2363cce0971ec760f8167afc58cdb66b9ce0419d5d9085d88c95ff3367a6a057
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16772 bytes
SHA-256: 585e0b6602f5914686b88eacf2b4111858acf830f499a576138b897e3ffa6042
font_02_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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