Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb653a41bd58409…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 20:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82c1b32707cd13bfc9023880df73fbda SHA-1: e5fd287bc6c1f4d1d62d7833550c4897ba23731e SHA-256: adb653a41bd584096bce333e9fb98bf49f51727f54f615387eadb08415f9f817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The presence of a URL with 'utm_term=kodi+18+apk+download' suggests a lure for potentially unwanted software or malware. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript for redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=kodi+18+apk+download PDF link annotation
    • http://yogo110.com/userfiles/file/jisajozivula.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/56416205016.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/1893551558.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ad6d42a04dc2a769dd6073804a52124d/42468249265.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/8673303652.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/98084034536.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/77887379704.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/71458200374.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906071612891466389.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/jijobabilirogesiritosegud.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/76329662147.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/81986773167.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ripoxazumit.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31357f1e3---43899466220.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/43bscjnpe1grv7vcn1di5dqcme/pubitibedusovo.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/fuzuvugewopivage.pdfIn PDF document text
    • http://beta-rc.com/upload/files/fifux.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/64335209889.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/demeg.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rutag.pdfIn PDF document text
    • http://gensugroup.com/upload/files/dadezijan.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/40829193741.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/mimexekobulapixawur.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109131506059034.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/68518526133.pdfIn PDF document text
    • https://ms01bet.com/contents/files/zetuguvutesulovaz.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/wusumetatuja.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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 16732 bytes
SHA-256: 34897df30bc5df376d888e71ff465af498f390ab989a40999aef1ba46d143769
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10316 bytes
SHA-256: 6a9e0fb880859a5b298ce024b17086c202f1aa304d38d8a818e1cef0bb2edb15

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