Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a75fe9fb280d79…

MALICIOUS

PDF

83.0 KB Created: 2021-08-01 06:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4fb1669cb27691e0943e997e9e3de04 SHA-1: 6bfa70d3f759c3a1a4b0155564da5846335f715c SHA-256: 04a75fe9fb280d79ada3f91a22eb3e7fafb7d7f64796048983fee6d67da0c446
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://energy-labels.com/userfiles/file/keguxunemifururiwire.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/10c1c618a2e5190dc5042055c3da64ef/46700354328.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/wozedomixitupegidobimukaz.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/jeziruzubukipaxutudi.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/foreza.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/xanurafo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4e34022075e51b2c2ad9a988378dccbb/76017580928.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3036c830ce---zijowinedasevuxojub.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086039e51c92---gadifilote.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/908423f59821d302c9f44fced950a4bd/pubufidosepevupowiwutuwe.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/943e860583215045fea97fa555d376d8/25801619341.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/kepajawilogevenodelaloxo.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/lanosefinofofirulazabo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/xigewuputesul.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/vexexepidolopilogesobug.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/lopazudifekiwo.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/14593575118.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3a01d457---78893179332.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210710104951.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/89759545030.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088885065e19---81432321652.pdfIn PDF document text
    • http://sooclose.eu/upload/File/37822171139.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bobojalopepebonagavevujej.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/lowibafuxovo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/69l1sqdinsgbujbdlkldavmpk2/bepeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=world+basketball+championship+friv+unblockedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 16380 bytes
SHA-256: 677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a
font_01_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 16736 bytes
SHA-256: 68c7152eb1a6d8ea04170e043522670b001766a25520b0976670ac53309af308
font_02_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 11276 bytes
SHA-256: add09cde8cdd5d4a9bc2f282ba0240f93d81911c4f4e3620f21cf82937ad6bf5