Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1e336cd706df95…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 11:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21c4b2fe57b0a638782e1449a9790781 SHA-1: 894586acc6fb3aedbb19a9791863c691b2875a55 SHA-256: 8b1e336cd706df95c6de144242fe4236f520e464bbff2b9c8b0562da3d37d1e8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to external resources. Embedded JavaScript streams are also present, which could be used to further obfuscate the malicious intent or initiate further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=ice+staff+code+black+ops+3 PDF link annotation
    • https://506hlapeta.com/files/file/39768195596.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109022033251952.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3bbfbaeb6---vuzugukufuvanifovewewolu.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/xazobepomegafimewil.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/52531438485.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/86827819813.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/83174999618.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/koximajutofofitig.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/57188062416.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/fogonefa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b13a5234d---92886403058.pdfIn PDF document text
    • http://zzquansu.cn/d/files/matexolijagusakix.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/jizuditoj.pdfIn PDF document text
    • http://tulga.ru/editor/files/dabale.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a957a54e6---lizutad.pdfIn PDF document text
    • https://salonrewards.ca/images/file/gagirisex.pdfIn PDF document text
    • https://egf.tw/test2/images/file/rugoj.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/7002665737.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/jabenenutum.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/kepozuvopenowok.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/19376289094.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/vevifiwotipadarojozibojox.pdfIn PDF document text
    • http://simoncaulkin.com/images/54125002722.pdfIn PDF document text
    • http://fabriquetextil.cIn macro / runtime command snippet
    • 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_off0000aef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 15924 bytes
SHA-256: 76b29b9d50af63170f2dec5fe98759f6453e1f9a72aace55e4837ce3c7b41919
font_01_sfnt_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10672 bytes
SHA-256: 22148882bbad78f89053d9e1ba15087b1278ab64f826b779274a940654fd9a23

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