Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ecfb4db050639e…

MALICIOUS

PDF

98.1 KB Created: 2021-09-11 21:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbcda132729f65e3c065a9a3f4812ae0 SHA-1: aa428e7be77418451e70b3c1532c1acc66eb6070 SHA-256: 79ecfb4db050639e362bfedbf8f9ba532341d8e79cea27712643e621a89c6ea0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://www.firengo.com/userfiles/files/bupukulerezubemukut.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xosupolitom.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff981a180b---guzukegejumivutib.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/gobakonara.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/29169506338.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/regimifopakefevo.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/jamoromilokurivaz.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/sevutenexikabip.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/93930463666.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/84923237247.pdfIn PDF document text
    • http://markone-tools.com/upload/files/54584747124.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef325b08a0---3811105135.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/dudilenipasirepizamiwu.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/fizidirilo.pdfIn PDF document text
    • https://aashianarealty.com/file/xuletikituvek.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7f3eb520---wodesaworutum.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/16737640494.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/giwodijulolapasud.pdfIn PDF document text
    • http://sergeybazarov.ru/file/zodatapabekodisinin.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/80915397712.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/41532688153.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338fa8afff7---13013844418.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/51377451173.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/mezotef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hungry+shark+world+hack+2021PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 26336 bytes
SHA-256: 653dd434478d23eabea0ebe7ca2bc391fde593d7e4333b72523d5a7f1cfa6874
font_01_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 11004 bytes
SHA-256: 58424b6f1938dd5fa7b5827afc975cbaa48cba5f553c48e539d7d78b8ade266b
font_02_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 16708 bytes
SHA-256: e30f31386853028b8a02bd3cb93d5ebe52f226edc4351ba1f0abc78be03253a2
font_03_sfnt_off000159f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000161f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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