Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2338b1c260ddedf…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 13:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26337219076024aaca2f0738cdf84798 SHA-1: e24e3eaedd56e84cd633900f34477540dc463649 SHA-256: b2338b1c260ddedf458234c3afc4b6dd5fa341acf2c605af0c6a898bb5d80943
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://cdwy028.com/uploadfile/file/20210909132734.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090806223759.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/38290759718.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bujemerogezumeseli.pdfIn PDF document text
    • http://topflexsports.com/uploads/15050821180.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/guzabuxutojekuvur.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/nutakesomudilosejatirazar.pdfIn PDF document text
    • http://195exim.com/datas/files/puvopa.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/segelo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fc24d93f---jijirazu.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/64447255112.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/jabilagegamupabuvoxewaji.pdfIn PDF document text
    • http://africareview.in/userfiles/file/671665077.pdfIn PDF document text
    • https://ijp2.com/contents/files/sisonufun.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/5958204475.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/870a944eea5084f37d70ead9eea79529/93120873065.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135818ccd9df---74132200955.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/91377196649.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kakaxufepa.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/55673245640.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/86240955834.pdfIn PDF document text
    • http://bastola.org/userfiles/file/tufexomusapijowusedimo.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/52739986296.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354338920bf---31183715819.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/85028854517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+unlimited+data+for+free+on+android+2021PDF 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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 17340 bytes
SHA-256: 920d5f2ecf11bfa36f56d7cd7403dc8d1239b2b7e1f7ce0431857b0e5811ce0f
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 11000 bytes
SHA-256: 85180a4ac8c30a442936bac48d0039baa57c75dfc75061426a99f5c44b700e70
font_02_sfnt_off00013867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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