Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ec51658cfe7cc2…

MALICIOUS

PDF

79.9 KB Created: 2021-07-26 14:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8250b675fbd4889f9a881f208e5baa5f SHA-1: 9bf2eca9ea449c504b226133a0cd37fca5c94537 SHA-256: d1ec51658cfe7cc2ce39de8f400638a401f33674e0355ceff5080acaf2977c1f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS uploads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://clove7.com/userfiles/file/81189360731.pdf In PDF document text
    • http://saltokisport.com/uploads/files/zanipipofatixaj.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/16911764273.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/kalazapeval.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4434_20210621081757.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/25eec9f42fe7df11e658e93713c6f782/juwolakotumafozomuban.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68454927439.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa3fc5228---46445558626.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26912380cb---29934440816.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070120220490.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/18628847800.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1ca53541---xenonelifujamivojebovag.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/76278ceae8a4b6d121e31ebc0558138f/dawulebexul.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a4dc20ba0---96380678143.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/70po6pjpca94al24m8b04disv1/78639273122.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/jokepi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8c0619337ce9322ebc0771fa5b7eb36d/25643841275.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qjdjvg79o39bmqg2aro6b9fp40/falaluvoxom.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tatarikeron.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/vomupedolorixevawasukogu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/25657010430.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608791ef9719d---momajupe.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607274c3d179a---90035342394.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/koditeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kamyab+jawan+program+loan+nbp+online+application+formPDF 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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 11116 bytes
SHA-256: c64b15782d9c5203dbfab372a51da296b9e7f7515be5d766bb95360f81cd9f7a
font_01_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 16668 bytes
SHA-256: 3eb6c471cdd4677539baa174fa0a6743c3e6587251b99ebddd6438ac027fab90
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1