Malicious PDF — malware analysis report

Static analysis result for SHA-256 f179dd7b139883f8…

MALICIOUS

PDF

94.3 KB Created: 2021-07-03 07:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcae48e11f5226f887ed54ec43bffafa SHA-1: 20196662b6f4a9ef745e440c6681e58c54788cbb SHA-256: f179dd7b139883f8d2f832c220c354b12c4f6510fab3fd1b29bf50b3fb71b66e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised websites, likely intended to trick users into downloading a password-protected archive. This is a common tactic to bypass gateway security scans. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs further supports this. No scripts were extracted, limiting the ability to determine the exact payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/280d410a2cf3a5716648d257c9eb6b26/13812733011.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f5d80bc2c2daa1232730bd54f85537bd/44766569940.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/923cca0e74134ef004ba318c29c4e38c/julibudoxifiziken.pdf
    • http://abwingssuffolk1.com/uploads/files/sodifizugudikete.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aa19eac0ce26437dc1f0a5983feb5392/81884401565.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079e7c456fc3---wurodo.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608345ff3a7e5---jewaludulajitotosafon.pdf
    • http://allg-gyn.ch/userfiles/file/defuvusumezabazatarar.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/jivekuzuf.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8h5t4qbp4dj96ev87iaanrskqa/11120195770.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076f90cee0a3---65643087386.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1c82215bdcf21e3b342b1beb9252de7f/71693430255.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/tezipunovifexo.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdcef036c---goniwigalugif.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608381644fbc9---liramevivelusezonelufe.pdf
    • http://casier-a-bouteilles.fr/file/59424777315.pdf
    • http://accessiblevehicleservices.com/userfiles/file/81922020194.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8ea94ce2---polozomigegidasavozu.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf643bc610f---18837957356.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e81678fae68540181fce462d37ca92e3/23837509844.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8176c242c5---14318690415.pdf
    • http://ural-resyrs.ru/data/file/loruxumikedema.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead116e328---46149622082.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9fj8nf2610j8f15oil0umqpbgv/24351456394.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4b48be21---pijeposudubegasozufi.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875872d24a6---felosofuwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fallout+new+vegas+power+armor+training+command
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 16792 bytes
font_01_sfnt_off00012041.bin
8506320fa52249941c7e7869191b311ee650299f6cf3a4a24806202189fac62f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 11088 bytes
font_02_sfnt_off000139f8.bin
35078fa41054f0343c03da80ba1d0ba5916bcc1e60b3161d9072374dd38718bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 19652 bytes

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