Malicious PDF — malware analysis report

Static analysis result for SHA-256 a779c7afcba015cf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 17:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21ea28735132cb4b451b778fff5ad17c SHA-1: 513231a66e1237153dca76396d1c69eb2bf7ba2a SHA-256: a779c7afcba015cfd27dde790d07a567612812221916ed0b6dbb3ed4f182f72e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'iforgot apple id password' in one URL suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/josotibo.pdf In PDF document text
    • http://kayapalinakliyat.com/file/pemapemorase.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/93221824687.pdfIn PDF document text
    • http://agro-partner.com/Image/files/wezigilevumesab.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/dugag.pdfIn PDF document text
    • https://sealskinz.ru/files/file/78452757525.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/81699169433.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/22374076998.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/fadisov.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/44879325708.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/29462372702.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139b476e1251---29650452493.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/puzakovugozekazube.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/54628226927.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ceb3b996a1da734e77f363c3abf3f32b/sasunotagivuxuxusosalar.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/23468792487.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/691021032.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/gedemuvapakoxerupinemezif.pdfIn PDF document text
    • https://noddy.nu/images/file/lesosile.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/47156724559.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/3285805300.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/28082505068.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/dafav.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/91601033306.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4d39f6128d81c3af753deef0efd86228/nadesuleju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iforgot+apple+id+passwordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 10608 bytes
SHA-256: 6fe931ecbaeaac69e58a5e3d5f28cc24cb74e1de4e2b9befbef091b692aef104
font_01_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 17348 bytes
SHA-256: 80733b2bbfe0b22ac49a704659d8ccdf5dea04e392176796bed78edbd69de335
font_02_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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