Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3913b66c5d9910…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22723a7cea0bd18a8343255abae45c3a SHA-1: 8452359e9045413ed299b91231b5bd57ca8679b0 SHA-256: 3e3913b66c5d991007a6eba96e461b9889d87fcdf5947d6473cb3bde678dc198
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document acting as a link farm, with multiple URLs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160802457c2a20---wajaxojina.pdf In PDF document text
    • https://daiichitravel.com/uploads/news_file/reselowoniweba.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778c5f7d226---figovomizifofebozase.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/xodemoxuwutoraxox.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/50770820320.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609188868c3b0---85511835204.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/43294331059.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/97360478838.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae1b3acfa---xepavubulanelovapava.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035c94a1d8---mopomifejudi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/91725839171.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8d9cb10f---68719892400.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xaxupofaduguka.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/m22arcri10okd8mgqunja07n6q/1874058801.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/22159135931.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fb661779ab471c38520e133c99bcfba2/81733385997.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/gopofufane.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/worugagez.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bb48df87a4c662ca9e1bcb6c077088c5/fesukofiruvenuzozuv.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2f445e35513ab0f830380b0f247d8d42/21510888894.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719dced1f08---sefigoduzesakojadatila.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e151a9499d4---lexeromu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/080631409093.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/47374370043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=movies+like+kissing+booth+on+netflixPDF 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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 10624 bytes
SHA-256: cfd20e6e24327f239dce99adc5a4d65fc6ffa37c2dd46f6816d9b484c870156a
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 17836 bytes
SHA-256: 825453b2cb870bba4ad7f4e5aa66046c8fb8e6ef3f7c07932ef95b209a92037a