Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca464f0f0987268d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 19:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96688173e610f45a20e5c70c28823ea1 SHA-1: 2f82363a991e668a5ca46ccfec43189c8932353a SHA-256: ca464f0f0987268d3ba10afd76b003e33dbbdbb730c69c14735cc542dded1921
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 document body is unreadable, but the heuristic firings clearly indicate the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=the+rivals+vi+keeland+read+online PDF link annotation
    • http://divapharma.com/uploaded/file/9887667665.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/bisezoribenizowuvi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/magegi.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/mivonezexunolili.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/69221353907.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29596516240.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/87338763127.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/leloguriz.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gijozu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/56960889131.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109051813217871.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/memunerikixu.pdfIn PDF document text
    • http://ailizia.com/userfiles/76650074979.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/gezapajevibotosik.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/20760156498.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/loxubixuzubediwa.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8f02be39---livewotuwaxuwitifigivetuv.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/besidavuzopikogijigifitas.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/68426353335.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50e5d048---82573068807.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/riwawav.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/62174665600.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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 10368 bytes
SHA-256: f23814f32ee455c19456f6f84fc262b9e369b238a518e187c7bba77573e303fa
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 19928 bytes
SHA-256: c2aa5c89a219e564d1e051c3d06a84fbf044315ac55d5774e666cfbf957dc72d
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1