Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65ff9d783dd7100…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 09:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8c02f781658fec72ff264b133289fb39 SHA-1: 1de2714ddc36d9887e42c6db2863ff0f105634c9 SHA-256: c65ff9d783dd710078ffcf53ec551dbfaa7aa249f9ffce5e2c161d86274e5534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded content are heavily obfuscated, but the presence of external links and the overall detection profile strongly suggest it's used to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=mutualism+commensalism+and+parasitism+are+the+three+types+of PDF link annotation
    • https://ancoraeducacion.com/images/22148198777.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607307b44de61---73380424568.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71eac0f99---pesikisuzovebavekoko.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/84371707346.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/19622582600.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/tinumaranewabifere.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/66202777193.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084884030ca2---37162995343.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dc65735f---wixikiravikelawudiminuzuf.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/51049091511.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ff104d0100e20c054c5840b2b78a12f/50007836734.pdfIn PDF document text
    • https://anfauglir.com/images/file/tesube.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/550c83508ac7171b857d6b9c91b369e3/82840847418.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//resemarikokomifajafit.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/gefozudimu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a422a58e3bf---59390017516.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a328506d5---juvawumiduxi.pdfIn PDF document text
    • https://wita.lt/images/files/90106349878.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c45659708b7e693414b5f94d106cb5a/jifarovoluziwerabi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a859989e610---mizemolugug.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9af7b8bd---xobifusak.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/27087671337.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/30309729517.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_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16960 bytes
SHA-256: a3ac22a8e2e3002b01af8b7e1c8d7ea7b434e1e509cfc7ad2c2a488225ff64dd
font_01_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BD 11092 bytes
SHA-256: 75c7dbe25d6ee3dd096425bd130da6e54c85925af2272d68eb910f841b7d3aa2

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