Malicious PDF — malware analysis report

Static analysis result for SHA-256 9937d62f06d6d7fd…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 09:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60a417103d9e48fca84db76d9a9c3cd0 SHA-1: 1c6a71814ea0ef7e360a927c09c7a51c44f1e32a SHA-256: 9937d62f06d6d7fd86d10c7c63618e682315dbed11d890494df1bc59f5cbccc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the presence of many external links supports a malicious redirection or download strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://krisoc.ru/uplcv?utm_term=clauses+and+sentences+worksheets PDF link annotation
    • http://jkohut.pl/file/81476588839.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/50356b2374e1fe17ddac4515f1e6bfe7/bulupamasugov.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/fagurorim.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/pufumozusitatanimibitobex.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/dalimakeresotu.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/lidupepesekawadupusaxew.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609285c1d6db2---veziwavunujadosutite.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/81771496708.pdfIn PDF document text
    • http://htwy.com/upload/file/ximokizemebisowasut.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ucf3ndo2tvdaiao749toekam97/15601430800.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/83784368b1562f64b5a029f105812f22/86411857201.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kirukajefalolali.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169cd0f0b41---10962374951.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2affa615b3f50c93e04ac72bdf954b9d/77072880597.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/57666773369.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/26666534688.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a849693071efd2aac435eefe78d7da52/fapesifabi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fubomemitojogujajupim.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/e0tjv5od1o00kpfht27brgkn9k/kexavixoju.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/kojiwanojironilatifewit.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/30d0a2d46b1489bcdbcbe09d47fdc926/tomolefuxixokegezub.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/57319726665.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad98f918571be15ed5b4816bf616dc6c/30975484953.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/86098849145.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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 10684 bytes
SHA-256: 0eb621d6d6ba1852a96328528b4709b818a8340c3179f87144d82abc48f96930
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 14924 bytes
SHA-256: 00f1a2b767a804f2edca106d0a80c57cfcea7755189952a18cbe336f5fd69327

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