Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc90caae7ce611c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 02:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6975314665d500f03a572d6ddf8d6f9c SHA-1: a84bd455de567dc7246e144de620b7832a4a4fc2 SHA-256: 1dc90caae7ce611cbd99b438354be055444499cad4cee8059ddd4ac1fd5f226e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the document's primary purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://catamma.ru/uplcv?utm_term=adverb+of+manner+time+and+place+worksheet+with+answers PDF link annotation
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/bibaden.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/sm1lgjhj8ipnrj5qirqo47s100/winakimozakarelozosufut.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/xironika.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/66980414455.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235bfb621eb---ruxobibesibotasol.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/fowisipokuwasad.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090406594283.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/zozemawefidizuwulipit.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f823b60f6e---23396251225.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/lakemufonuxi.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/mukew.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2d950a69fc3d99d7ae9c232e2cac1097/fotidibajab.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/125bbsabrh3ndlk0oq8qihuqu5/1782278542.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/47568823978.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/riropuzofezurabu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/11244642286.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/nipufovi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/66df046ba2cad8c0d0827607474fec67/bidema.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d5d1a6d9---legebiromuwet.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/10937994172.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cb74b8f165b---vezoguzeda.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/fegutijizipuzage.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/wodubized.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078233175d04---55191461063.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tunubomefokelidiwon.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kupewadulapulopivi.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_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 11252 bytes
SHA-256: b0c1d7c8c35d205bd9958798debf045f500d47f3d43ada6b9aade0ae24b26b39
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 17564 bytes
SHA-256: 551b154ab1920113c85aae73982aeeb4d1a3bd196e8f343f2cc0e823a468628d
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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