Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5489a6b686a5d06…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 02:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b30c11a1829501e4e08aeac1b90ecc73 SHA-1: f7bca4e4ad8bbe72b9f3aaf2eaa3d6befb07107b SHA-256: e5489a6b686a5d06bdbaaf36681838ebbf3589cbcef3e23a83d1363244a17d8c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=the+bachelor+watch+online+season+25 PDF link annotation
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/28111198601.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/lesusiginasanetowatoruv.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/22187898694.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/61455888767.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/37232482627.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/zozugopuziveb.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/96387113779.pdfIn PDF document text
    • http://all-premium.com/user_file/files/tusefugujiponizuragote.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109100705558279.pdfIn PDF document text
    • http://wych123.com/upload/files/vomibafever.pdfIn PDF document text
    • http://getdol.com/page_data/file/kewuseja.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/nulofenidabojiwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c1c3ebc---sobegimu.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zinebano.pdfIn PDF document text
    • http://budropol.de/Upload/file/sokiraviwonejogo.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/jivoki.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fekikizeg.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139aac57a9e5---kuduzejololalejinadex.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/magajugaler.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090914284054969.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/tofipopusokebenepupusakid.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/dezupugozumemajigowipunet.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2807608b47eb2767e51eaae11daa0fab/maxujovelom.pdfIn PDF document text
    • 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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 18252 bytes
SHA-256: 1355d6b9ecbde09144c9f1909b50530825e3703596a053a73b2c4157c4c76e81
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 10772 bytes
SHA-256: a9e879e907638ab7f00b03ba496aceccc2f75e678206029a082b884b313458a2