Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebe52499c1f8a19…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 22:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7fd18821aa2a171fd55c9b0cdebfb186 SHA-1: e66fa4d0d23ccd43a8fcdce5166d243bb70194aa SHA-256: 8ebe52499c1f8a19c4f0cc8bdf1e0f0185095f8ea207251a19786a95df3052ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thueotodn.com/uploads/image/files/4910162940.pdf In PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/fobotapononevofuta.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137572cde848---satejelamivud.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/3234953596.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b7a14b3399f412652a45572291421d82/magexoruro.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/84249806262.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/1958234423.pdfIn PDF document text
    • https://tuyendung.tlipgroup.com/upload/images/files/nujatumikebaxijelafaba.pdfIn PDF document text
    • http://precisao.org/files/files/tolinugofasubenanasavo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gepunire.pdfIn PDF document text
    • https://bloc-immo.com/images/bonafesanodetumunifew.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://prasongp.com/file_media/file_image/file/zawamafobujesubet.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/25292911600.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906131030.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/14300157409.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2782edb3---91960314346.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/2841336374.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161408c77da67b---batakamuwuluzawujewolopo.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210915215643525340091vkl.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/55924580009.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7235e3f7f3907413c8bd5140e1f44ef7/fewenewoxipuxininulara.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/lejuvozegaredowopupu.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/26343150311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+naruto+senki+versi+1.20PDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 10944 bytes
SHA-256: 6aeef5f4cd53be72ad1bcfac71cf5b60b1c6e6a5566b55ce26ce5e7554bc9ad9
font_01_sfnt_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 17028 bytes
SHA-256: 5c83fa05847923faa38463d04862a18b32ba62f22774f5242db3f5eb824485cc
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1