Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eb62ee9c02fe85…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44265829e2bbf4aad7241381df2b9d42 SHA-1: ee2d582005d9a05317c6e2259f5e1b58545a797f SHA-256: 17eb62ee9c02fe856714fe8f6b256952d225f5616ed9992b5fece8aa900dedd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, pointing to numerous external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://chrislahoda.ca/userfiles/file/tenojoja.pdf In PDF document text
    • http://baovekhucongnghiep.com/upload/files/jonamexigeri.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/90569928781.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xogiveta.pdfIn PDF document text
    • https://tavio.ru/files/file/zafopowemunawe.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/45993423476.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/5210417374.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140090bf1a53---24291840994.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dilakiposufaxovozutezatem.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe9a43083---taxoreliludeseru.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85799822645.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/wugenopatexor.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/55971367857.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/dumaduvotisej.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408be9753da---15808493116.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/93f6dfcbe4e0b2a3de4b18dfa9202c14/83455159433.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/kupuz.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907032040.pdfIn PDF document text
    • http://szpk.hu/_user/file/45902052577.pdfIn PDF document text
    • http://klhl.com/userfiles/file/piwiziruradir.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/80004138887.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/tujoniwabijisixelutig.pdfIn PDF document text
    • https://ratoempat.com/contents/files/kipisozigeturekus.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/ropenojewumip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+send+contacts+from+old+phone+to+newPDF 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_off0000b220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 10872 bytes
SHA-256: d6e54c74ab630d5ce050b6e93f32cf5bafd48a3cd003cf886baacad47ea914c4
font_02_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 14512 bytes
SHA-256: ed9e49f92067bdeb5b3762bda7a6af855ea39919949734a2f649499108b4fb19

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