Malicious PDF — malware analysis report

Static analysis result for SHA-256 c211fc8bdc62ad18…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 15:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1c7db54cfa282010f63d18e669bd846 SHA-1: 5948976d81dbf5e47616d2b8b9c08e44838b976a SHA-256: c211fc8bdc62ad182585cbfdcbb540d0a6e2a91e444fa02621a3b2e44ea29815
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=print+image+using+thermal+printer+in+android PDF link annotation
    • https://doan295doson.vn/namthuan/images/news/files/wegogiv.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/soruwogijibe.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c0f337729---86997828697.pdfIn PDF document text
    • https://ewt.cz/res/file/84394691339.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b1f38b751d2ed6aa131cc6a0a4bd6092/xomeruwedinazidisexewo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62280400133.pdfIn PDF document text
    • http://praguetransfer.com/files/file/34627513297.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/4613693169.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/fodujezu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tabituvumamubenafabeg.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/gofosovoxibaletum.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88234871035.pdfIn PDF document text
    • http://webs123.com/userfiles/file/zofukupujipibemadato.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/58636993837.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/xibekigosuvunovusulen.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630493483.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/guroleworizon.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/61824845710.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/kixasuwegezowivipor.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/caa8e51e48de831773d7c49c5ab5d963/pigugapowozidudamodawimo.pdfIn PDF document text
    • http://elitacasa.it/images/file/jusuloju.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 10940 bytes
SHA-256: 30432904e3b63f3dd3a70b40fd72d21ebc2c7804b0d2ca6110ae5104bf1b1fd9
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17800 bytes
SHA-256: 0af82a08743333833f8e79292fea431597edd164db7f8cd01ab882123f22a310
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1