Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b85b8649565f623…

MALICIOUS

PDF

85.7 KB Created: 2021-08-24 01:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be9c51e98850557b086c44a49d993623 SHA-1: 56e1ae580d865d2922ecfa488aaf2db51a04abd9 SHA-256: 7b85b8649565f62319c945db92d1461cb8091a70b33af924e59619cfdf032f56
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://salocchi.it/userfiles/files/16413797827.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/xelujalifenipuso.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/83387547352.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8443390a5a8a556a1d69399b6a133290/megufefumogi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/32230301407.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/30945265628.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/suvodul.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/85577505213.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210721071356.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/23802125876.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/madijefojoza.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93e74fdc6---fumikedeluja.pdfIn PDF document text
    • http://zuche0551.com/upload/file/44521436549.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210611130301688.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wobuberabixizunepina.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/95962355321.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70574eb687---63919875233.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/31892381977.pdfIn PDF document text
    • https://rcot.org/userfiles/file/14856645536.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/bb8ef4f1a9b3b18389612b8f50179d36/fijesusebamisabe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d0980d7d---5107535680.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9338fc65903bea6717918a63fb38cb0e/bowazazujojatig.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100981e5e010---19914752835.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160df9b422f2a9---51392085786.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/55877937237.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/julosilubabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=funeral+speech+in+englishPDF 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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 10512 bytes
SHA-256: 703321e9568088cdee6c7b1cbb5b30ce2bfb4ab0bee12c5dd19bb1548b146d91
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 17016 bytes
SHA-256: cb75ab9740fd29db609a445505f8f5191e6f7ec96194a1f1e41425354a9ca5f4

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