Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad9b8b2cfcf4e83…

MALICIOUS

PDF

100.1 KB Created: 2021-09-01 18:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c560416856fb53cdb06e7c7554feb1ac SHA-1: d5be2d91689a0a69b9dcd02f3464033d46bd01e9 SHA-256: 7ad9b8b2cfcf4e83bbd06a50f1798fb3d684cefa39516df4182f8b08a6da99c8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document's content, though heavily obfuscated, is identified as a lure for recovery secrets or private keys. The presence of numerous URLs, many pointing to compromised WordPress sites and link farms, suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dancephoto.ru/userfiles/files/284897198.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cbf5d7da0---kolejinegipoxanapubakeb.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b7c1cc3d---22350587682.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105300048260561.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/875eafc6c1fdf83e0d8769970b2ac850/mipabesomoxuzaso.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f20b913bd---zalusejojixoruwozupo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f07fa6---movosixif.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/delidutivelebukodufiva.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/lupibepetidibudumolej.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102d125511---fanelemazulidisefel.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/410c19a50181475a4fff8a970c3f5ab1/giwakogekun.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/nafukikuxaf.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2e13af9d54addeaebb8d473bf49eec12/88638314089.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/51007150064.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/63202221735.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b21c5e2d6cda55526f5d9a6207e8183/26974591697.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/nujusimufubera.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/mopogugekevuwixasulisuzo.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/3520662993.pdfIn PDF document text
    • http://katachizu.com/img/news/files/funobatijimi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766690eed77---kokagukerek.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877e28bdf80---38225485916.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce60b1f0d---79531538354.pdfIn PDF document text
    • http://alcantara.cz/data/file/sogogodaxaloziwukovaxi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/83e4e55a1a5b620e9870ffd4c898646d/gebosenutisarudizal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=larry+l+peterson+computer+networks+5th+edition+pdfPDF 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_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 18152 bytes
SHA-256: ad55184576dd8857efa79da50e6286d399f4f4ce2dfd0d0dfe61fdcbfe98feec
font_01_sfnt_off00014e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001666f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666F 11368 bytes
SHA-256: 82dd96692dbef45def81b7ed93bd68d135a07bcfd46b0a03496211583b03c7a4

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