Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9c5de72f94623c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 632203eeb777011f996d3fd7b20f9189 SHA-1: f8d78ed250cd3f96815c254a58c37c57ed659bfb SHA-256: 2b9c5de72f94623c4e2a89cfacf4f9380dbad013f930585bdd55c2e22059b9f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kermoulin.com/userfiles/file/44019865272.pdf In PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fc294aef391d64ce64807c0420bb19f7/20279341219.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3a41ae3a---vekesitazip.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f274f1c03a---tejopaj.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/nogofos.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef57c24b63---gametadilirexofe.pdfIn PDF document text
    • http://blccy.com/userfiles/files/tofigimo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e73251d1---gekutape.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/wubofibelodiv.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kibozowizoziliv.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43ba5030---1878075249.pdfIn PDF document text
    • https://pecsikult.hu/files/file/42319451970.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1e687289---29256818817.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/tififutasavarojukudeti.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/57274241713.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/wogofakorefenox.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/17103575177.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/38454610702.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092880b4eadc---nokarutidivobipafuvitut.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/79665c56657efe889ebc65b5882f1b67/94948453606.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/bogibed.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/setofefule.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c0b74204a94d4542bb350c996a1de720/71700901881.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/856a0bc451328665560143d9722c8a2b/womeferawizatefumupu.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/fotezovadunap.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/11335966155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=frostbite+in+mouthPDF link annotation
    • 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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 18536 bytes
SHA-256: 91d993d9b057870a0638b9fe60145aa53d252a96269e82d5350122a41664f1e9
font_02_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 10384 bytes
SHA-256: 1d8ae0bd1ac71b3ac8b6aeae7faf5a7947b323278a97889f79ec79a223ecda20

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