Malicious PDF — malware analysis report

Static analysis result for SHA-256 0487be875f9de5f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92abe42d6726dfdf4b46294034f1ab83 SHA-1: e76e5655de9c6bb9972f8b8878e891431f4eda57 SHA-256: 0487be875f9de5f90c22e649b9ff3a1a26a749eb898861585c4546150b504e5b
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to redirect users to malicious content or phishing sites. The 'Password-protected archive handoff' heuristic further suggests it may be part of a multi-stage attack where the user is instructed to download an archive, which is then protected by a password to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=mp3+converter+android+download PDF link annotation
    • http://archgeo-leszno.pl/uploads/userfiles/files/98689658814.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/gavejesigejegutazafub.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/14138300979.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/23413903838.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/woletusawejap.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/28192384019.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48957763418.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/41318542240.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/35170234751.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902222355957.pdfIn PDF document text
    • http://skene.es/userfiles/file/petuvef.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/petedopumekafinuv.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/28792927668.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/kemuruwibuduvaripoza.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sigusowolupasawa.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/93179659831.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/67199256801.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210916_A19D5730A2ED2BEC.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161315250ae7e3---lakufabubirovizej.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/vedawetefudujokoxilofiji.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/87766605297.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/786bc49a7dc607040b0beee3e5ab23f2/woledibuta.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2f6c8edf---pejetamipe.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10656 bytes
SHA-256: b14eba37d609f0ba477a9fb6c69214db4d8bcd402d4e51012ab8286155f6b62d
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 17420 bytes
SHA-256: 5ead8443ffa9f92fa93b5c12455f9816f18e37687d85c596e6f98d57bfbaf10d

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