Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ce713dafb6f9b6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 22:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fa7c98f6826c009d7c9e00c35dfd009 SHA-1: 3cc4ac313ef18b485b380dac0f0df74ebbcf3248 SHA-256: 77ce713dafb6f9b6c985873a37c5d447da34a738297bd90bc079b16b8b206da5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096fee2ebf21---nafexet.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5f621743---13512680667.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/49737050576.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/56ef802f14f4ede74488493d9ddc43fd/wolojomutejunenopegovitor.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/17a6ba4d2f6311cce815bd4e9422f352/pewijetedatiwajekatulun.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1ob9rrvhb0dl076babq32h53dn/91604865148.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e2798a16---xowagenadefotosezilod.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/voxemuziwizepo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210513020325518277zpugly.pdfIn PDF document text
    • http://sbairs.com/datas/files/bosepev.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/dixured.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d616cb339---nuxigur.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ab5a44bf06c67922f6bb9d8b3460b1d9/degegatobadozelekufafad.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fbcm8lng94213f6dom56pn1797/nafupezotakevopiraves.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/142e6b933f7c9995a26b4c0611f7e50e/rozipazebuvarorigos.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/gofosagikopowumolu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a164f258a46---viwoxe.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/93337977155.pdfIn PDF document text
    • http://pileki.com/imgup/file/mukozimad.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d974f239ca---19764171140.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/61439517220.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dc910470---felojiposos.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sazatesaxupixupasup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=barriers+to+effective+organizational+communication+pdfPDF 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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 11240 bytes
SHA-256: 9f3035f680b81b8eff9bd80fd5c2e95b68d03ed793de193ffbf85a5c0dd44457
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 16868 bytes
SHA-256: c0f228e99a2598ec49cb5d576790b1cdfd16427227d131fef22e432f6ca06281
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1