Malicious PDF — malware analysis report

Static analysis result for SHA-256 af67ae525f04eda1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 06:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 733b3a28aeb7dae59e3a21ab20e08601 SHA-1: 7766abba4ad230caff15872f56fe37d2849b1bdd SHA-256: af67ae525f04eda10515103dcb93a3951c7ea52cd9ebe482799dde5028afdf8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious websites, with one URL explicitly mentioning a 'free windows 10 usb download'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=free+windows+10+usb+download PDF link annotation
    • http://df-2.de/images/daten/file/74470499619.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/88902277698.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/kezapidilufavevop.pdfIn PDF document text
    • http://446888.top/userfiles/file/xexupuxe.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/vamolesapufuraxenelokanop.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/koloderuxa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c04f6719be55c25f4e5291300dabdc98/49841208075.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/mopumotibekutoduziluxes.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341c47e5eb7---15654818015.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/xumufedor.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/gofoxojabatodopojoluludi.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/4326217753.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/wetulijorovipijagugefose.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/wagogomupumamafelapadofo.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/mukuje.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/zefanewewupaxubewisalunow.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/35892853814.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/vitipudimiri.pdfIn PDF document text
    • http://muszempilla.com/files/file/49194178918.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/fuxawuvusojoz.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3a310d86c5a3ed0ec25d4cda697c9ccb/rokudapo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345cce6f1d3---lotisitatujukawow.pdfIn PDF document text
    • https://reniuved.it/file/fokolatopexoverodab.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/semepobaputojarozivoze.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16084 bytes
SHA-256: 710bfe3927472a3f9fcd529e53091172a876cd0697ebfba5fb3e897876c1427e
font_02_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 10620 bytes
SHA-256: 54ba25891ae62c11cb25f7d9b7932f10b636b7c034cda4bf7d2a9289c58f16c6

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