Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5a7d9a848e929…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 18:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f82b03b0bd7b149d3f2538d04d172e0b SHA-1: ab841495ecc2710599eb24343425e9a1bb36788c SHA-256: 20d5a7d9a848e9299b717e7f90af717e2206003131ab6575e52c688ce4395ed9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, some pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or phishing. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://onderhoudnlgarantie.nl/upload/file/66951170375.pdf In PDF document text
    • https://cowik.pl/upload/robulomupakar.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/devamudeletanazo.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/vilivim.pdfPDF link annotation
    • http://maekalocal.com/Maeka/UserFiles/File/66054085324.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/5934813246.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/porukalopenekapabofovi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-19-33-09-45.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e9c8bd163609fdb4f026c773fc3efefe/63326512261.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/31754244090.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011625267080.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nivazali.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/dalotatowolezenamax.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/63726421325.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/denewadivesetexatodek.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/dusukenivanazagejozevik.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/81427416282.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a6f6bc07---74046586668.pdfIn PDF document text
    • http://prestopc.it/upload/file/fefiwenapilatoli.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/pexugadug.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kasozomuvinuxozepiwowaz.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/xikuluvozusude.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d4fb5770---wunigawuvisujamojenadosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+data+from+dead+phonePDF 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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 17776 bytes
SHA-256: 0558fc32f5ff8a828182aea305370fa99c4b58841a368da0c62aa8be0ec9c07a
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 10716 bytes
SHA-256: 63b789e75e6fbd5ef881493c999119affab1fcb74e487425535575f582f22dde

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