Malicious PDF — malware analysis report

Static analysis result for SHA-256 485752105e4886e2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 23:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f0567293e5eef56783cc221b25aaad7 SHA-1: 49c8e6183ec939204130da28f82a147d5ab8d290 SHA-256: 485752105e4886e2d7154a02465aeaf17fb6d374d31070d411fd79fdbd785b96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm points to multiple disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of these elements indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://phrabat.net/UserFiles/File/43248128465.pdf
    • http://faptvmedia.com/userfiles/file/95866256175.pdf
    • http://budaors.varosom.hu/userfiles/files/36093530844.pdf
    • http://bctlorraine.org/userfiles/file/zabisatilenusuf.pdf
    • http://elverum-revmatiker.no/images/file/98369116927.pdf
    • http://szjwwj.com/userfiles/file///duxilokogiloligit.pdf
    • https://handientu.vn/userfiles/file/11570057146.pdf
    • https://poganyvolgyi.hu/userfiles/file/84947769730.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8e702429---39710544509.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/78671312477.pdf
    • http://pixel-pro.ru/upload/file/pezika.pdf
    • http://reelproductionshd.com/userfiles/file/mozuruvabosiza.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/34099422912.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/426a20701833ea14c9e5bb6e3a66d9ae/mogutadopewalipofi.pdf
    • http://musclecar-taps.com/js/upload/files/wamupakarinojegerabo.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f4831b18---jexif.pdf
    • https://lecourbe.dk/userfiles/file/rabibuzati.pdf
    • https://haciendaloscipreses.cl/upload/file/76262180781.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/24913355363.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/25268971793.pdf
    • http://docando.es/js/ckfinder/userfiles/files/doburatadorafosiximi.pdf
    • https://dienmayminhchau.vn/uploads/news_file/lifavuduniku.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/nuxipe.pdf
    • http://qishuochem.com/siicea/userfiles/file/leboruxifo.pdf
    • http://katachizu.com/img/news/files/80730218042.pdf
    • http://abwingssuffolk1.com/uploads/files/kizoxapajinusofez.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613515cc532e4---mumupod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kies+air+android+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f155.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 16792 bytes
font_01_sfnt_off0001096c.bin
726128da9c05bd28fe5d876b0f3807d0299fda8bfedc37d65c702e54700d0fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 10232 bytes
font_02_sfnt_off00012076.bin
dbb1409d26faf71de185c00e0d67f2b65a698055494ad9635f5f3d58b4bff47f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 17452 bytes