Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84696f0bface919…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 08:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad1d52f8984ab60d94b420b2f3b14ff0 SHA-1: aa96cc0f13eb19b30087379342fd1d70fd569e38 SHA-256: c84696f0bface91939104adb3dba00cd7dc238bd900a275a149c0b639faf858c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites, indicating a likely phishing or malicious redirection campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=mastectomia+radical+modificada+tecnica+quirurgica+pdf PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/74df4109d48ab419fcfc679528730e44/39862464370.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/pemubirovuno.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2f17ff93.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/vasoxewigelapurezekeni.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ct6sa2adn1nosdtgbulttulp2e/12292244373.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/17244076028.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/rubupufetelorapaderuturev.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/togogaru.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/68104525888.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c1aa0ba86d5e71a7889cdde5588cfa22/joxaxekujasurekojurakak.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/7636931987.pdfIn PDF document text
    • https://zhansq.cn/upload/file/barameduwavosib.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/19493678289.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/dibelosogofenawe.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dc59db772cf870ebbd5c8215cb5a267b/dawanejugaxugo.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/52947848142.pdfIn PDF document text
    • https://europartner2.pl/uploads/tofobiwewizipo.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nafadagigabozipumugos.pdfIn PDF document text
    • https://premium-house.uz/images/file/fitategafusibe.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bcb46e9152fc507cbe351c7d18b9ffa3/bimiverunurekagufu.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/pijejiribinefiwarasal.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/sozumo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80f30c7cf---zemot.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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 17936 bytes
SHA-256: 983cc768b56553ce341f3470d8017fedfff192c9827f65ac3464d04998a527e3
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 11204 bytes
SHA-256: 79b272f5e1f56018a7d84c46517309cd6d2eeed424640474f75f7d4e1ad24ccd

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