Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39f816ca6a4eedc…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 01:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1172a20e4fc0fc1323c135bbec14db06 SHA-1: cbeb6f984c2f0c0b1ef6706f30abde9bb414e7c4 SHA-256: e39f816ca6a4eedcf8a563eed65bf97c84934c5bef06b3d7a1a8ec1ea529e7fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/66176508155.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/87705104820.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f16b35650---pukowusexizobidojolazupe.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/87587061912.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8ca0ef322---93304125397.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f29d7807c---77801882025.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/xenevoxesibowaginini.pdfIn PDF document text
    • http://artospace.com/pics/file/91714255480.pdfIn PDF document text
    • http://le383.com/uploads/files/nafikolutawele.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210605000708.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/98997052110.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/vatesone.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rpadtvufakai498qbtvfqk56ce/96067930672.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/lomudif.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/nipifelovajalumelokat.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/30715877586.pdfIn PDF document text
    • https://auto826.com/uploads/files/taxirinagesewuka.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/sufulajasab.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3ea21311018ec307ba4dd6851102ad7/83350612543.pdfIn PDF document text
    • http://hnysft.com/d/files/5543761301.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210701184654.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ae5c1a17d339d0109c272be1e9d3a2a8/12462244681.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081767ddd722---fanoven.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/xojerekilujul.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2bbcb9ef---kimukemujolobidofavofu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/16908423032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alternative+medicine+review+pdfPDF 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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 18588 bytes
SHA-256: ae4622b670b408bc7b2182059a05d91fcecd03280565c1c4dd597aba8fcd5da8
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 10624 bytes
SHA-256: 6e5658889f0456b9f110dd748b2379530c7c8f4c74c05e89b05f471caa578133

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