Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bbd44edde2f4a9…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 23:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a036ddeb587e57894d43fd19e24b4ad5 SHA-1: 194145b650715b4b21cbe3d7f09953c1f6c05485 SHA-256: 21bbd44edde2f4a956e31986b3174f8d1cd565f5c675076872c2be3ec741431d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of a 'download button' heuristic further suggests a deceptive user interaction is intended.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=the+pirate+bay+pc+games PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4265f3e90267cbc3384c8747cdfab0ba/26722980105.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff1fe8d2c---45943582588.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/nefomijipupaf.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7eade5ce688c2cb432e3fa60eedb9638/dejikitozotevilifiwu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57254bf1a2---futoz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1dp1nugi4qgbuodktpegp5v6c7/41672119267.pdfIn PDF document text
    • http://hospvetcentral.pt/site/upload/file/gefebe.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98c62bafe---zifikadiw.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xidumonafosepudugefam.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8fd136784a8b229e6481e8f68ed984b6/35593888285.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608913de354c6---mapode.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d379b4ee---10406684579.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b036a8edd32---11494979550.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/melelorag.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c7829c6996c34c32b0b4c3dbdd95e52a/fagerazumukideg.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tewewep.pdfIn PDF document text
    • http://fullx.net/files/jutojazerunulemewi.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/goxewerefexenimimufeso.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54c9d98829---gijazaw.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/xasuxibubarepimalawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607625930822e---45019128903.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e5f53f7a9---9756484158.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2f61bfceb2880eb10fd9c2aab9e2d157/6030321209.pdfIn PDF document text
    • http://aimic.com/userfiles/file/noxanusovoziridu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e11guue84v494jacrrko2o9qa6/noroletumu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877f6e2ebdb---niporil.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_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 17292 bytes
SHA-256: 6481f485a62a7253950de2aaabc5de1ce018c538ad515e6d47782c715a0902b7
font_01_sfnt_off000151d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169ED 10768 bytes
SHA-256: f67414e0f713d4629a9e0b4b7576c14185881dc1fc8c0939f4c9a4485d2f0465

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