Malicious PDF — malware analysis report

Static analysis result for SHA-256 26acb2d33aae42e1…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 19:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7bba9b3e68cbe4162caa383871fef930 SHA-1: 3adb4d8f39620e4248cf4eca7c71039b74e40807 SHA-256: 26acb2d33aae42e1a91866f5be0fc6832fd0ea394f5d12492ca0f9d71d5335f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=causes+of+indoor+air+pollution PDF link annotation
    • http://charontrade.hu/data/file/48585493117.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156de40dc509---sazusevodufenituvulimun.pdfIn PDF document text
    • https://renetravel.ro/images/files/kevexojuxenafu.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/78746935723.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bavokezabewuwikefoja.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/lusapuraw.pdfIn PDF document text
    • http://pay2pay.net/upload/file/12973299697.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2e36c2f0---jipotawamik.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161536baacb700---juwunirazugetozoxuvakukik.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1fd84d73f---nekoj.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/razixabotimuvebafozupir.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/24865074569.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/16289750187.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/92391363117.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/26557446281.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vobumofuvojoxibub.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75517742015.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4aad58a5f---20036807025.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/36863907250.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/33029411209.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/91011067014.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/99442579584.pdfIn PDF document text
    • http://fkhd.cz/data/img/loxavasapataxawomukiven.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/45349804580.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_off0000b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 10624 bytes
SHA-256: 055a759f889cff1d1dcceb019f5c0fc2bdd1143c09cdddc8cbbe72e7d9cf0fe8
font_01_sfnt_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 15792 bytes
SHA-256: 0e7ac4bf556694fa3d95432bd4fc73a47c8d92df206821f30c70371d9a93a919
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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