Malicious PDF — malware analysis report

Static analysis result for SHA-256 f499ad9dd3f371e7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 10:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea7d74d6d5951278900efb6820226dc5 SHA-1: 11733860412420f61eeaeef03a9c2bc8fa67f555 SHA-256: f499ad9dd3f371e789ee4cc3eb31f6a402ecc872673c5aed767c24be372d0021
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure aspect, aiming to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://12shio3.com/contents/files/2324434230.pdf In PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/mivovujolo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/557454a66cf20349ba6629c37f21dca1/lupor.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/23858243038.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/wanotexepafisubidotasadof.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/demufamavolemiruxuxagurum.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091220494980554.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/woxipezawegawufajamofone.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/64858622d03dd9d05686f8c622aa5460/gibolatekofixe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb79a21393---potuposozibubazup.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/38798055789.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/libadaxivatozip.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/femapuzujupot.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10678397824.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f79c6b8b---95841993134.pdfIn PDF document text
    • http://cy2hand.com/userfiles/94738930907.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109060806599416.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/99069006732.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • http://workontext.ru/media/file/94031959668.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368cc99bbf2---zuzizavanapowogodezak.pdfIn PDF document text
    • https://derfo.info/resimler/files/87337691385.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/nesewasaje.pdfIn PDF document text
    • http://sdds.be/userfiles/file/josareradinufowabejoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+root+cph1859PDF 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16392 bytes
SHA-256: 3e5f8ea5d4944debfdd28dcc682bfef0b8cc8956e31bd8f036b59ccf5cf8e519
font_02_sfnt_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10408 bytes
SHA-256: 4c3901515295d9ecdcbf8c0f167f67ee333dd6a6b4379e5d491dd3494fb43695