Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca24b6c563e3624…

MALICIOUS

PDF

78.7 KB Created: 2021-10-12 00:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 150aeab37a6f1908cddd1b3b88ac9bf2 SHA-1: d1e883c0bb09dcc9e008c24a484ab0dc7596fc92 SHA-256: cca24b6c563e36246a77160b3722753158e91a45acdc13f6fb5ee53984dbad0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=rmb+to+brl PDF link annotation
    • http://vilocom.net/webroot/img/files/74970465421.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161633f372faa7---luwiwonupodugituz.pdfIn PDF document text
    • https://chp-travel.ir/data/file/57578010921.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d9aj71tc3q4irje90jedj24eb0/78799055994.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090421141373499.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/limoxosesobagewig.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4103153d07de0c1131fa1abb7c635107/94177106051.pdfIn PDF document text
    • http://jonellchem.com/upload/files/63381965983.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/kojikoziresosinupali.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/26692957615.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///paxunotar.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/63296550639.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/42362621778.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/84405036390.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/83001033307.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/wenef.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/fewarubi.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/48586578548.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/wufax.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/gefesanu.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/7308899509.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144424110526---69132764319.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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 9796 bytes
SHA-256: e4c9e71bd7770e01e25ae428d7cd40db59a1d6a80d5091b333563e5e899d1400
font_02_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 18504 bytes
SHA-256: 04638b8cd36cce5643842e7de12e748bfffdc1420e4276ebc9edfe2fddc688b4