Malicious PDF — malware analysis report

Static analysis result for SHA-256 db65fc5f6b76bb7a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 09:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c008f088c8b222f7bedccc9a10937d4 SHA-1: ffd7e0ea096713f972abd7315670f2afa0917302 SHA-256: db65fc5f6b76bb7ab52c3eef9f3ce314e7394e8ab41dc21db82ea6400e738a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=a+guide+to+apa+referencing+style+7th+edition PDF link annotation
    • https://geloracinta.com/contents/files/82053106991.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/31416162569.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/53191243311.pdfIn PDF document text
    • http://it-hair.com/userfiles/68755670334.pdfIn PDF document text
    • http://jaqalsports.com/files/file/19422759832.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/18726879721.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685052249d---kilunuxubaxupuresuregaki.pdfIn PDF document text
    • https://moolans.com/uploads/files/77342942174.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca580df25afedba13fc0b19dba48c27e/37636317889.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/98138853250.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/mutakumibosuleguxari.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/37087310162.pdfIn PDF document text
    • http://hotechike.com/files/files/nakoregokifazitilakabi.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/dubufeno.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/25371135776.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/89c00b8f46604aa4825d6b34d28f4bd0/75440824962.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/gozezotokuwejemopal.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148cd9724701---sunotikuxiviborowim.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/27868211166.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/simemeja.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161362585bc40f---xukoxizis.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/91932056661.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/tisofegavivemifekutolegif.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/gidewozurunufotid.pdfIn PDF document text
    • http://leguido.net/files/kexalesavezu.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/meguz.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/68505885107.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/rifezunosubagela.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 11144 bytes
SHA-256: 6222e2d8b8d5bb2bccf3806e72bc41bebe3f4d11fac44f65f03ee4b664d605aa
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17872 bytes
SHA-256: 2e4ca79b8b94b03d9e7147571b80fdfa18ab6ad0f04408dd5e8edb58fb69b9b5

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