Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bf231ca3a1b28a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 06:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d6e732ceca92f06b29776a05271f789 SHA-1: 616d2b2742435ba5f6bdb646510703c8a6f9dda5 SHA-256: e7bf231ca3a1b28a75a3c0d67bfa6271af5e38c0ea6bf16347d11d5e22c4ffc5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://waycreon.net/bhaskar/yii/upload/files/wafitu.pdf In PDF document text
    • http://headrepublic.pl/images/files/30080482120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2c6db93---nefuzosemetonob.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/rapakoxumabawisotikofojit.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/uamf4d9oc6vqfb8d4kvufof9v7/nofowogakimotenegol.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/19842988899.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/wesotalof.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/votisuwefawemixaxuvaropa.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/natiliwowaxadotejopi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/ranabajugat.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302947ce543---ludelatatave.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/65639928410.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/38454138946.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/75578128864.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109042234424501.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/18876956175.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/4672481719.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wejebovezuwojexasubosak.pdfIn PDF document text
    • https://digireg.li/upload/lazimoduj.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/boganoxorilularevateba.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe2a7c6af---gijuzodobuzox.pdfIn PDF document text
    • http://skupka54.ru/upload/m/weduxugokatexowizafot.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210916_071427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gotardo+anime+appPDF 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_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10376 bytes
SHA-256: 22dd2afad0602acc84084927e23465d0ba7d71aae76f552ba9aeeee22f7b6d63
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 17104 bytes
SHA-256: e9a66589508343e119176a516fa5efb8009d3da7c4984869560a96b98450fc5c