Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0a4b139529075c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5f5aab043e700ea12ec8744852b048c SHA-1: d3c8853912ee1b27403742b6150a0d2356aee236 SHA-256: 1e0a4b139529075c04d05e2fbd02e115997ae28fa3a69bea8e788d7b52846695
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with the heuristic 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirming its suspicious nature. The PDF contains a link farm, indicated by 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', directing users to multiple external PDF files hosted on potentially compromised or disposable domains. This suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://back2wood.de/userfiles/file/4270268096.pdf In PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ronuwate.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/dotavefamali.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/40531177998.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/18168479946.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/16248971986.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffa2b0844---90661515976.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/nuwefi.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/25266532939.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/28799243383.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210914140411572796.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/13702680270.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/liweviwixawoxujixilobiwen.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivimebupike.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/jofujupikiwojinimuboxi.pdfIn PDF document text
    • http://i-dron.cz/data/file/4351408616.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/lekef.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f51a77a1---damumu.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sosewutilukalazebuxife.pdfIn PDF document text
    • http://artediapharma.com/upload/files/jifitatezekujavuxig.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/ledebiloj.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1dfc104e---68923385660.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/26805357158.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/69jlg1b9m2ql1h3i77tlqepb13/83270369659.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/73616691593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+user+interface+examplesPDF 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_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 19524 bytes
SHA-256: abd3ec41048723934c70b534a22231dc695907c0d24867777dec7d0afe3438ba
font_01_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10964 bytes
SHA-256: d5c59b0319e2b3a5f7771d11d016a236da15046d2addb24eea5354edd3f50f75

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