Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aa5eca7484724f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 17:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b3bcf381499ec6a12ed8c16c7e46c279 SHA-1: b4878e19c2bb85472d41d0e35fa01de676012d8c SHA-256: e8aa5eca7484724f1fbf4676e924148a35126c5c86ae7314e0cf297fe07e3eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=grammar+rules+for+sat+pdf PDF link annotation
    • https://frisch.ro/files/file/62541141693.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/29360789332.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/51847342997.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fasinemo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0d110d02---1754651212.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/miziga.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/venafunetarinaredenes.pdfIn PDF document text
    • http://ipceurope.be/assets/file/65259509119.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cbf26ff0---zufibuvoluw.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/40702074861.pdfIn PDF document text
    • http://gerocuki.hu/user/file/vipetefafanoz.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/67670219811.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/tipelar.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/fapufutesexofobedum.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/dowetamovok.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ilejos.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/93812745571.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/57291bf05abed3671462960a1c24c3dc/bofupiriruga.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gulipanuvaxuvumavi.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/kufupisamaser.pdfIn PDF document text
    • https://samowar.ch/upload/file/tedokeralojikojinolu.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/24978592605.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913045251.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/92722908062.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_off0000af05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 10600 bytes
SHA-256: cb9c552b98260b2f5b799f21b4a2e9f7dd455af865a542172a63179014186c33
font_01_sfnt_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 14760 bytes
SHA-256: 2fed89259da0509ccb14607a72f96e635a8fa6492b84e562279f3b7adebefbbd
font_02_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1