Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37f1868832742ab…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 09:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a706eca64842d691cf21de1ca06e89f SHA-1: 7a54087583380217733e0c4cc9c11f2a4494a0bc SHA-256: e37f1868832742ab3a73911c83630ed9668455bca10f63a679ce1d97ff108b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The file's structure and URL distribution align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vojedew.pdf In PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/3967596195.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/22094180888.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/karekadab.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zuwebagap.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/59188404950.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/robenimudeluxume.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/mimizebafa.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/tumadiralolivutufalixoliw.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lomodefevasura.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/kulibe.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/16809934992.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45de0eff5---49274763416.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/21846565487.pdfIn PDF document text
    • http://innotack.com/userfiles/files/1186663724.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/44654419013.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/94570928274.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/lakubisatupova.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/wimam.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wefotujaziboru.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bafe55eece713ed6c4363da66bc55e27/guvedetewilozaranudanug.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5c8219c4---36614213657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+refresh+viewPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/53421257402.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BA 18600 bytes
SHA-256: 27fc66d53628978a2615906b9034f9c1c348a376f79e5cb02840ae6e84f95b87
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10280 bytes
SHA-256: 1aa9a5cb18a5e4f1e0aeafe74a1efa7c84da6ac03ea9388e40a6c2aafec3e0d7
font_03_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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