Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b22321a36c3d5e2…

MALICIOUS

PDF

111.8 KB Created: 2021-07-24 00:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e180b323ffb9badd37cc698e0e912fa3 SHA-1: 771de1249c36b61046f471bda589d538d4444397 SHA-256: 6b22321a36c3d5e28b32315bbecbc4ac1f26eee64cfaf48f24eae4df7fac5706
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or for SEO manipulation. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cnkls.com/userfiles/file/1625468059.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/negugimesu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6781b3d49---geliviwabiwenasevegezurej.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/78226254499.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff0b22041---fakug.pdfIn PDF document text
    • https://tsegypt.com/file/44570890737.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/1861977740.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/34980078050.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d6260f8a0b2d2be6453d6bf1858b42a3/nakijukapafuboxuzinig.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210523020704.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9f830113---xopajovavawikat.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ce5e155a4---xusavenorozunofedimisaf.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f6ca14a5---jozuzarexaj.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594941ac9c---98915922692.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac7cc319d---80652389094.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e7f35683---jidisizujegamowisusup.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/zukobiloganiruwugosidob.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fa52fe0ad03748b19d96159e2de5a8cf/29171478092.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a3c5fb62---mebogisisewaxetufarekeroz.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/7909891614.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/38plj2efqj3sestvqvikujdb5n/lawujuniz.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/tutatuzudezotijujitat.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c041d91a93b---guviwiwozogobojozuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ejercicios+de+plc+basicosPDF 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_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 19656 bytes
SHA-256: 596abf6e77b90afcfc9d0dd40a664e5b4b262e6fa4ccb2ca5bd4d5a9b0102232
font_01_sfnt_off00017f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19735 10556 bytes
SHA-256: 473ded49985b3349c491d4b6b1efd07fda779bdb00e4dc0642b75f78289d3be1

Open this report in the interactive analyzer, or submit your own file for analysis.