Malicious PDF — malware analysis report

Static analysis result for SHA-256 9754d4097be3b6bb…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 12:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1754c48dd275463fbf53a65514b6d863 SHA-1: 513ea1f37a7c0079afb632fbed71747939c17694 SHA-256: 9754d4097be3b6bbfa8d35a1a83484e5ee01589bd5a404755362bd26764f14bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://chukgoobok.com/files/fckeditor/file/gajun.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130920253ea7---81376451499.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5573104498a604ec361da3ea6ae29a85/pagikisapi.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/23093079056.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/90930303223.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/7836246146.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913685259e3---22491796018.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe47cf53b---40221576817.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/mibolib.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210816_171717.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/28153332789.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094522f4466d---32334824178.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/jusozanorimu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/vunam.pdfIn PDF document text
    • http://evola.it/userfiles/files/jebezap.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe49925589---36302594959.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/aaf367b0a9e6e73ebd299580b4be9653/90721714112.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c9b80609a0933caf1ceccd71ee29a682/84179673685.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pubajaj.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/lejefugel.pdfIn PDF document text
    • https://afayl.com/userfiles/file/berik.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5661e4f1e3---34242897329.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/39131659295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2+step+math+word+problems+3rd+grade+worksheetsPDF 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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 11156 bytes
SHA-256: da4a8c05f81a18669152182951b3b659cf14daf173ee04566425ba037d76e0da
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 15316 bytes
SHA-256: 68de89ed444c003407d57f0da44b4199b8df2222f989d2bf045cb4db0802e005

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