Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaf1b47e4e4d80e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 16:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcf8ba3ae7710d4fef8d149a79922f5d SHA-1: ec795e088e51afc1229137419c804408f0b21479 SHA-256: beaf1b47e4e4d80e1905a98bae3dffe89b1b2cdd2c24f93e85b13bdcee09930d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=galaxy+a10s+screen+size PDF link annotation
    • http://bugskin.org/userfiles/file/87151396087.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137abe5eff69---fabetunuwibezavoje.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/75834181529.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/jijebini.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/satixizugibuzodataf.pdfIn PDF document text
    • http://acelybio.com/upload/files/fuxaxexapujefopenozugaj.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9e6a680e---pofazezolowiwev.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/37148954572.pdfIn PDF document text
    • https://securitydm.com/slicice/file/24032306262.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/50589751473.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c77903f72---89467703694.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/wuxegomizutonotufumef.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016050641.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/kumigexirot.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/webigokapufunebelodit.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/35904951893.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412fc3c6f3e---21523421465.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/duwafisefajavuma.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210919_8378E608844379DD.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/gugisewebexe.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/19075410221.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-18/images/files/fegofaguzor.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/pivixasopeguvelidugezu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e382155f06b021ad0bc19e9813bcadf2/4880291515.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/lusagisodegaxapuxuj.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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 18520 bytes
SHA-256: 6912127abd87d977ea6a962ed0bd297f1f6421e32f4a431ad89712fde8fb3ad7
font_02_sfnt_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 10496 bytes
SHA-256: 7e6a3a46fbc09aca0bf69a32a5e869652b42a5cfb8b2ece835c49e8f52bf1cdf

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