Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6f2ff39402c4df…

MALICIOUS

PDF

99.5 KB Created: 2021-09-07 05:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dd2b9ff9f32734cd8e83020ab895baf SHA-1: 07bf1b4971d98c44fb6e980d4b95527539ea2ecd SHA-256: fd6f2ff39402c4df63afaad7c6bea646ce12eb04d9b6e71269a958e9836ac9e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=punjab+text+book+pakistan+studies+9th+class+pdf+english PDF link annotation
    • https://cleanenergy.mn/uploads/files/piwanisejowogur.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/bipisofepivujeziwitovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f400664e---wakunuboluripajanufobej.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/86130660920.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04294513a---sozixewogorelefupuwuna.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85671761080.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/32704840708.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/47037724663.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/kipapozuduriv.pdfIn PDF document text
    • http://polkovnik.su/upload/file/98945033849.pdfIn PDF document text
    • http://adice-area.com/pictures/files/dofilupifagejamewisijika.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c00a82101---ribojudijagomekubusow.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5ee1b8050c73441e14ef4b15f615626/puzelifavigudufodijupeli.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/55887450638.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/83589667b632a4d5f330743ed39751fa/rafozevore.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622506257.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ace7de4ae5e36752d289361a61167868/gularixomikifa.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/978659734.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/500323961.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/89383123912.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/lodelodimikutorumajos.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/l6jq072gq9ee54m7lskifmno2p/dijukapipozuwonatuwilewux.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4c6bb8a51d0b2e3e6c6af87868596482/6647024014.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/zalupex.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39145edf60---64063765302.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_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 19096 bytes
SHA-256: 8e753f9b5e5b3a6595dcd6a5f740a131d89187d2cc2da0e5efac78c1b29c4dc5
font_02_sfnt_off0001650f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650F 11532 bytes
SHA-256: 7d64688ca7816883e2c82889a2cb289f51dc011943d15254199397bc72af5f36

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