Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fe73ef74ebbbc5…

MALICIOUS

PDF

86.7 KB Created: 2021-08-05 14:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b186b40cb0ea5157f91c5a166adfbcfc SHA-1: 91486910e7dcc0fe70ffbcdf9dd78c77a5416cf9 SHA-256: 68fe73ef74ebbbc521f9d8324a7999c7e30ea08773e462fd9ba0ce97c622c357
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rendiamovisibiliglinvisibili.org/file/30020685835.pdf In PDF document text
    • https://mimpishio1.com/contents//files/42200025902.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/20911337867.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6fb17ac04---8803528160.pdfIn PDF document text
    • http://www.celso.org/download/37634672366.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d60aa32469ad59d775cdc2e991ac6015/xijemupojajepamituf.pdfIn PDF document text
    • http://goref.ru/files/file/19436255656.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160730016ac575---fuzuzaje.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/sopotofaralelalek.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ufutoluzowegova.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210718_429DEEC497B21A86.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/12503140271.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca19a50cb---54716758610.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210719201754_bn67fe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b171e8b6931---petikaxalibipumukof.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/rejikuved.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q4n6jjarq4a2k6affup8squb47/xeronegumisajoxalaxuwovi.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/biwugekitaluvoxosabi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4311cae39b---35871473345.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lds9t3sho0rrdds57g3siitjb1/boguramudikavamavogesig.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7d7g51l2ho2v98upebkru2t3uv/37934346534.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/30168237263.pdfIn PDF document text
    • https://kaimano.it/file/butumedumemosobewom.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/47615533268.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608752be7b18a---64410510432.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b2fc0891---78317505995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=iroot+v3.4.5+%28one+click+root%29+cracked+apkPDF 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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 11056 bytes
SHA-256: a5af681810713b66a77238c45b0b6b8caa8fc4d07e0c1891f6abc90e8f285cfd
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 17172 bytes
SHA-256: c5f492b818a83a1270d89434f052c1ec10b071eb5e2af5a517a32301f9d217cc
font_02_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1