Malicious PDF — malware analysis report

Static analysis result for SHA-256 316b4c4df560a08b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 17:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfeabc6dbb972d41d5bf908de4a0245b SHA-1: 1755a1f79fc2c8ce8e2fb2767758be9e8370fc16 SHA-256: 316b4c4df560a08b05a7d6d416ae9d30dfbf8e167cefbce211f8b2790ede666b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, often involving JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=photo+trash+android PDF link annotation
    • http://yule-sign.com/upload/editor/file/20210903225035.pdfIn PDF document text
    • http://marketingnews.fr/images/file/65383936344.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/nebukiwujinaniranipixor.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907080520.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/buwevosumigomemed.pdfIn PDF document text
    • https://kaimano.it/file/mesuwejuvoligoliwoje.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c0ecd97f---pepepepuxaxabofakum.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///56877492707.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5avm895a5t1vgkgkn1o8rurshu/91831928866.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905112835320.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/pamojemizakabotilelepumet.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/wekojixegupatitolarawapu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/86144865129.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/17105530707.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/vedod.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9bf79408---pisixifubudopalaguxuxevi.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/22605791350.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e73ee1ea16c82d68c5ff3226f188074a/likilesupezagugavaniduras.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/tinofewezimixavopuzu.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/97159403527.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/37371193767.pdfIn PDF document text
    • http://sushi-belovo.ru/files/79971919934.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_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 17212 bytes
SHA-256: 82e051b5d34e8722fee9526870932807907b980ddb771a3f1e27b972d809d87d
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10168 bytes
SHA-256: cea110a1b1f5b1a5706f570d7c557a45032399deab16c66e9989d4613f3f51b8
font_02_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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