Malicious PDF — malware analysis report

Static analysis result for SHA-256 380636d46c1a6c55…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 21:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5019db7571cbcdf0e6f7fe01d4ac4f4f SHA-1: d0b0cb1a973ed07027d0ba18dea39aab431e0623 SHA-256: 380636d46c1a6c5529eee3d7669aae5c27ee2e84e8d8d540b0d7251146e44ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of external links and the overall heuristic profile point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c3f21059edb263edaaca170bef011f98/pijozikenunefofe.pdf In PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108131651138225.pdfIn PDF document text
    • http://renknh.com/ckupload/files/nitazuxoxiduzenej.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/ruzesedamulupun.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8c70af0b4d26375bddfa22144d5db947/76117410487.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3c51ba43---nezedekagezixitala.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/rifigofelobodewawe.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/otmunm0gcfhicggdsb9sgf4gsi/dojisa.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///bidusijakokij.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/13687492409.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/50047993986.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97235392733.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/96489685292.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/78551630789.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/sonimisoruroxuwujutam.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/28391618951.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/49351424047.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/11629847688.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b1d0b78c14a512f828747bedf583d040/falewimuwiledixivakonak.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/rotux.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee51cd7ed1c---bidukitadekafafakoxa.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fc1411338---popixakeno.pdfIn PDF document text
    • http://artdental.hu/editor_up/53377610010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cmc+rope+rescue+manual+4th+edition+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_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 11096 bytes
SHA-256: 9648e880105002119dcab48fa29a00a25e75ddc3369b7b68d74206d7ef1cccbb
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 17876 bytes
SHA-256: 52514503c9c779a53daabd800ce11961e19d46f77432ea04cac1ef4636ec758b
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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