Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d064118e791aa9…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 02:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9087c9dbf88b737c0c22eff84187b6e6 SHA-1: c186a6bc7accd02834266538742d3dd04d981b83 SHA-256: f4d064118e791aa9c14211ee544c6ce6faf37b069791faa6e5f039e7bba23009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://locktactyuma.com/userfiles/file/72661006503.pdf In PDF document text
    • https://ht-cooling-j3t.com/contents/files/kupugivodazivefevejabi.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/32092715763.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d008813827---13890349369.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/womulesozirawixepelod.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109151644513815.pdfIn PDF document text
    • https://basisangka.com/contents/files/49287364004.pdfIn PDF document text
    • https://vitanov.rs/files/texanixisategitilofani.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/movomigetal.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/zesomojesizirolepizux.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/venuvazobilamubazuzuvupu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/jefolivarosepixisod.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/powod.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614579b145ac5---28777741908.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/75492546150.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/40566947009.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/15905859442.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/bazugawe.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/6549802913.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/22769479672.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/gekuxerafopidi.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/15953348083.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/70fe06740ad6115e626e304393f9667c/91606151812.pdfIn PDF document text
    • https://il-gusto.com/images/file/voravamabusojaboxolafodi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/23329225177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bluetooth+application+for+android+phonesPDF 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_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 15852 bytes
SHA-256: 3a195a1f749404f7af9dc8c52746cddaa14027b788b68d3d095a7cad4fdccc4a
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10872 bytes
SHA-256: cfd991b1b1cbc85527831fedd35898a61b4495fab636bf36cbde74027de2a42e
font_02_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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