Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ffeccc328ac5a0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 14:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15b0f8c5699b8d2bf538d71ce7f29438 SHA-1: d05844d1f34a7750675fc34c0d3f461994761b66 SHA-256: 62ffeccc328ac5a041d079e0429413a925709bb677585db4cb02a31604dfbb35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious sites for further exploitation or credential harvesting.

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://mdknoodles.co/uploads/files/92913936688.pdf In PDF document text
    • http://desushibar.com/userfiles/file/78711164693.pdfIn PDF document text
    • http://letdentalab.com/img/files/84586439311.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/34509691129.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/genutowa.pdfIn PDF document text
    • http://climtech.com/files/files/pevokow.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2caa4ff87---zivimopoxusezati.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vadizul.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/518a4395e75e5c9af24fa85f57030c3d/mirisidizefalenudevis.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134099929dd1---popowekama.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/venoxipewoduja.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///36889893217.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/tovovogogekilejako.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210919165406.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/fugij.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d7872c58---55751186672.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/tekixo.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/22711078568.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfedc5dc55---lugavibaraxitakadufowa.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/keregunoba.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/56503241285.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ecd9d6ae---pagirowolibadugev.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/mazarabilesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=assassin%27s+creed+android+game+free+downloadPDF 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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 10824 bytes
SHA-256: 756b3fadb5c95d0365686c8a292bfd22e3da1ccf8280c05be814c7f72dcf64d8
font_02_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 17008 bytes
SHA-256: 5998789fe3dbeb16cd2d8f4ffd8dd7f46a82b48e8726b26c82ab0c7f9a9df3b4

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