Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c81d7984df36b3…

MALICIOUS

PDF

87.8 KB Created: 2021-08-15 01:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da0f0d60cfb2a80ed6f4dd519561deaa SHA-1: a94bc10b90699942cde79b42ead6e4a352ebeecd SHA-256: 70c81d7984df36b339e6cfce54303aac8e2f810e402041b6b256e6b7ca7c8eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=calories+in+burger+king+crispy+chicken+sandwich PDF link annotation
    • http://dyglas.com/userData/board/file/88856617350.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/10774006752.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1a18d795---polokul.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/a551a68fd801f0fc179903f372d8d1b0/88046787596.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/21724120012.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f3b40be0d05---woxilax.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/mnrn0tm0j7mrb8cdbgn2v7pkp1/xibolivisalobewodijarif.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9660d4b8---16222042515.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/riragiwek.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a613c4d334---50189047093.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/35138653859.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/suzikimilaxapatopege.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd51a7ba0b---wotowitazu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a9d25ff9---93830555681.pdfIn PDF document text
    • http://www.toptehnik.si/images/50559391990.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/49994281442.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bafidet.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tolakawesurorup.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085b07cceff---72217130763.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975dc4a9cdf---sugux.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/vejis.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ae7cdd79---wobibokexexow.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16110c1dfa2b2d---patodojatuzulaxeruge.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/27711401842.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/redokizelorepo.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_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 11256 bytes
SHA-256: f4061edeac49ef026b4952446a233ee41afda94a1e4984c08990400345fa8725
font_01_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 17056 bytes
SHA-256: 6cdb28d9c98cc463251c5575720e967eab6e9dc3b84180d1574776ebdef62387
font_02_sfnt_off0001384e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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