Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34b7b9f4a637ce2…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 08:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5c0ee2132a57fbeb083628d55b0b1f0 SHA-1: a864a0e7ea1e572f36c3c61cfef67899c790cdd7 SHA-256: d34b7b9f4a637ce2a54e263fa21c89b30023e3bb7dcb5564210c6e4db8bdd266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c97c30a2---gudutarakodot.pdf In PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/79817806117.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/80366100269.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3481dbe715---27111758945.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/70809392274.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/vimawepesinogap.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/686383353d7291fb1993b05e5b20a01d/94694355793.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/100qftodmcfvbqde63dhhel8eo/82976861086.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/82813394021.pdfIn PDF document text
    • http://clingac.com/d/files/binefikepato.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/85100567950.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/44712295558.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/gilepe.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/56648347833.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a290af0c3c---39805379826.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/mezez.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b999b20d3de---kumolatozujuzafewupul.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2753e7c9c2---nikadekezexaretijuda.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160706925a1936---34466702924.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/latejodidepovegax.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/v79fi890h117ijph7cthlud532/19665935253.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096715720a82---zonijorevepu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/368bc233f77eda5f32781ee892bed757/joguwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2pm+cet+in+gmtPDF 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_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 20304 bytes
SHA-256: 12953e049dc45e0ec97158e5f8373e71ab1f63dc54439d3630069895c569f239
font_02_sfnt_off000159e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E5 10144 bytes
SHA-256: aa3ddbaa0f840f60de4afc9a457325b361a1e93cff9461e9e35d0d886f99cf97

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