Malicious PDF — malware analysis report

Static analysis result for SHA-256 392b4b5908158272…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 23:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8803475dce50aadc19a388dd2778ccb7 SHA-1: 73c2d0f8d2b01c5aab31321b281dbba76952eda2 SHA-256: 392b4b5908158272d09b777e3150a9a7e85125a3b15deb7e47e715d592ff507e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links likely serve to redirect users to phishing or malware distribution pages, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/96967242250.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8o5bk2bt9d7alcns6klhuffek3/22232547086.pdfIn PDF document text
    • http://cocoal.com/uploads/file/70985112045.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/49191719969.pdfIn PDF document text
    • http://fitviewer.de/files/file/3977737508.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c24ae9ad7---86750558771.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e0e981dd4---88990500180.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/kavivuz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8f5da53a---54402858651.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/51077012302.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/gafamo.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/runifaj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608478504df21---rubepi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16092af8de9578---wezotufevokerinep.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5c95de36---33524037720.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tezazovemipavupefevi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607408f6a5d0c---zafokufuzabubudizelolixeb.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090447be1f7d---95646567368.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hhk01sck7s2a7bdjr6om2u5hng/37421648209.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9efbbe5e---tojemuvopajadorefezanemur.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/turiweguvupesidiko.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f2e3126a7---favonubin.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/14723617886.pdfIn PDF document text
    • https://baglab.pl/galeria/file/jedekiwadef.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/futinusowigujoron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sportline+345+pedometer+instruction+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 18528 bytes
SHA-256: 5c42a17bf13af2953bb7d90c3b63128aba09c051729aafb8e546da8c855c8557
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 11236 bytes
SHA-256: 09db9f74e02d0e997efac71871199efb84106d190eeae87c5c822a52632683db
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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