Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0d2f07dc548509…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 23:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48c936ee3be063d74c16a6f7a70f47a4 SHA-1: 570d87efa02770bf83767b4ffe30ec10098579a2 SHA-256: ca0d2f07dc5485097bf1fa5c6d3d12192a77940374cabe48d310cc50df0e71a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains a link farm pointing to numerous domains, many of which are hosted on disposable or compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://megacook.pt/site/upload/file/lukerasolafofufuva.pdf In PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/83310024748.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210906_165449.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/kujofuwave.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebb3d5968667372c27180c2653bfbe5e/kudanorerus.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/65576214093.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-05-54-37-26.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/31220220712.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/xoxovitonajejutokut.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/60709164072.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/60985774130.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/550180202.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210907232225.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/101357336554.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c9f88af49516212b211a8d9e5e91a7ce/bitawuv.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jenuwuribofuxikuwiranenu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/bafuno.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db539330eb---64500360240.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/ditevusojawuvam.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/paduxanitexemudogux.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xuduzofibo.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/49358970984.pdfIn PDF document text
    • https://coevent.ru/upload/files/dozoxipukisilewedugated.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=all+phones+compatible+with+fortnitePDF 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_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 16900 bytes
SHA-256: 35ea06d3ffa345005f482f62190a883aa9dc513bacb3e398c4896cd9deeaf6d2
font_01_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10952 bytes
SHA-256: 4cc37ab79a7f574ee5b627d8e1f79baa1ac13cd0a523d52409fe920c2c3fd54d