Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eec165abf6f1946…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 17:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc8fb613e1a508638d693c64af28e501 SHA-1: d9fb9750d10fc1567273c575dde69fdf7ebf9ded SHA-256: 4eec165abf6f1946de642abeb0342b90156e0a06e73a2f6aab91d2a4ac36ea65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that redirects to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tucarrorentacar.co/ckfinder/userfiles/files/26392889571.pdf In PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/44805200979.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/kanadiregafeluzesesuge.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/76584503811.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/78359475430.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/800cd95d8ea3213dbbd4b4ecd7f45675/94327299822.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b7e4f6808a74d4e37fb15832325d2a26/bekemomaza.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/53677363472.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/93732939460.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ebb224ceb5a0245abba2e29efa0710d3/3899470137.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f80932e9b---26432981779.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca16b96ed---19110252241.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/98c33d9b9c3c981993b33a477fbecd25/narugadetex.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/14673043519.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210620034720.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/gumukavosumofum.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613270fbcf8c5---foribisojuzikevadosavutat.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/37350907781.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d548b051672efe96401602aded31d220/4649158641.pdfIn PDF document text
    • https://granitnet.hu/editor_up/54837766821.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf358f1fb---mowebepezajurajawolefu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b626ea03b---givilukad.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5de22dcb9---mifuxosibemir.pdfIn PDF document text
    • http://www.asslar.de/downloads/fobavixawajukudiki.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/27966810596.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/farovozigafor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=maxi+cosi+pria+70+manual+espa%C3%B1olPDF 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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 11008 bytes
SHA-256: 73b68cc74b3d75f27cbc03e702a1812ce4c111a34b374f1b66714d1402b09bbc
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 17340 bytes
SHA-256: 2da3a4274c055703c9a87157900626df5b6e747db03185d2f27f396a67974841
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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