Malicious PDF — malware analysis report

Static analysis result for SHA-256 f391a34222c489e3…

MALICIOUS

PDF

97.6 KB Created: 2021-10-11 02:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 832d9ca7b27230241857a80468e94f67 SHA-1: 7242b99d27aa494b9f6be1bf18885fefa929fbed SHA-256: f391a34222c489e34af4fa575e18f549211b1dbe3d8916425db6f7c253db754e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into clicking these links, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=subcontractor+agreement+sample+pdf PDF link annotation
    • https://kalashad.com/userfiles/file/tijuxuvopijefawajosepef.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/rorevufi.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/96941380355.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/55444197304.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/poxevefapananijabawamilut.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/12884355250.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/fiwexijofufo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/98ad9739315ebf11dd54e705b07ca483/noveluriwavo.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/60253078397.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b8cd9c67---87947093388.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/991c604a7f654d27b859affb9e24fa57/90284724362.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/40759120083.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/jupowazidarux.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/fawol.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jivevisuzepexipube.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76076006750.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/28978225058.pdfIn PDF document text
    • https://majubesar.info/contents/files/zigapogukizevupenadegoz.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/bufetelu.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/pumolemezusuzuf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56ba733d1dd7e55fec10376117320bff/xexivifuxawavuzitisikubiw.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/dekisetimagawuzamusek.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/7010929974.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/44249861120.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_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 20144 bytes
SHA-256: 8ad8de44726d468819ea01572173cbf7eaa55c593931e27c3914d81cfe3d18af
font_01_sfnt_off000146b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B8 11184 bytes
SHA-256: a9547b4fe81748e7144cac2bd88011d76eb89ff46de5d2847850c815d2e79f53
font_02_sfnt_off00016084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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