Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4e179945b40fb4…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 23:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1669ea2ed2c4610cb9e9f87e59da03f9 SHA-1: f21ecf4d7c45eb4811bed0e4e0d8ebf8d26a5b42 SHA-256: cd4e179945b40fb4176835814c6944248eca722037f29bf111fa16d52bedafe5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The file's structure and link farm characteristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=alto+flute+finger+chart+pdf PDF link annotation
    • https://cfbadalona.net/ckdata/files/pagosikiwojininajuje.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16116e062537ed---99456078583.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/964fbfa8215dd25f4acddd1b62227633/27120006441.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jazomekakawu.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/85582108983.pdfIn PDF document text
    • http://altus.pl/userfiles/file/84024875518.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c01dfdd4bd2---8306842324.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60962563520.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/84umjlgsqkknqs043i32o4odv0/dutezabunozebe.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/nowivepuzexosaraj.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d7848e11ce397a4d113fc8aba6fa5fe7/77046613559.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1861d169---45618894859.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/51043790530.pdfIn PDF document text
    • http://markone-tools.com/upload/files/farosataxumejabox.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/23797106769.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/lewozowab.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/617864498.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2769e3471b---gujepisovipomedalibitusaf.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210617110112_bnya9b.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/mulilekinosadumosaza.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ce2de5fb77a44743776f1dbb0a1e9197/93563485892.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/65400929369.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f84c9c54a2f2322037477102447a01f0/82633907763.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/bevefavopiwakuzulo.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/poxinalewax.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2qrnlonvamdtkhaltltv2glau5/90848003998.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/85be0ed898876e863c6aa13c41d3e961/34896208055.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 10812 bytes
SHA-256: 0d379e53b4500e4aaa11ed9adc284b9de92080f70a6298c32b749410c0179f87
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 19504 bytes
SHA-256: 31b46d037a2cea4e914f32577313d0b8446972768af07b68e8559b4240b9a478

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