Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f8745699058a00…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58d4407bd8bed5dd668dedd9a885c543 SHA-1: dfce9c9f5a4f6f81b0c4d783b85efa75dbff283f SHA-256: f0f8745699058a006a2a27f1691245bb6c0ecc7ca7bf0c2c0cb454ad39658310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=reverso+context+premium+apk PDF link annotation
    • http://nollve.com/img/editor/image/file/2671532293.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/24300962575.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4190geutfm7ovquhj7bqk1r4i0/58348387067.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/poxakebidijili.pdfIn PDF document text
    • http://olympusflights.com/files/files/32644404644.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/xinilamimulafi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1320e9b5f---85555599128.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hpjtm0mla0d4jgvnuk3qru8jl1/59150575943.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/31145329974.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/ranozovipasadog.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/bumufiresurev.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/legubididij.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908024254.pdfIn PDF document text
    • http://henca.com/files/details/file/42699710502.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/ferevaj.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/31435758332.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/80127472530.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/11131476975.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/17361147319.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/50453011062.pdfIn PDF document text
    • https://aildf.in/userfiles/file/katusezopuvasowexe.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/goseminagizefibina.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b13ae81fe---womigexumoguteba.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pijawesiwibojixetuside.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/263fb20f112050cb3a66992e0d6d4938/48958991926.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_off0000b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C5 10896 bytes
SHA-256: b2542d59650d1f953b9123605271b09f92d0692989227c19d378de2ef527fe4b
font_01_sfnt_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 16824 bytes
SHA-256: f993ac04c7ae11a1f098b7f5eb95c1d865bd71ac4b61b1fcfeaf203070d81886

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