Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3541c9330ea98ea…

MALICIOUS

PDF

87.2 KB Created: 2021-07-19 17:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d39b2dca9a7d0affa98121a36b202df SHA-1: 3f6c4ed6527a83492d23208e7ed419451738b56b SHA-256: d3541c9330ea98ea2665735ed2a9e56440e2622c4f0ad3f9e17dfc2cb76c9bea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://eletvital.hu/uploads/files/zenowemitinibekomegek.pdf In PDF document text
    • http://kalikraft.com/images/file/40708733592.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/xaxabimivosuzofakur.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0a0966a58c2165d74ecff1c903bdb893/javejosixedisenolofexaju.pdfIn PDF document text
    • http://temple.mo/userfiles/file/24890314741.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/d0vlctlunap8ssatngrljgoh5a/xemowodinejegulaj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6fe197e254bd7a6fbbce80d8d3d6e75a/61022217386.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609660dd25cd9---dabofukuzidirig.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/xanupasugeduwepodefasuxoz.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/7216555076.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b94e83e6---17056171250.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/fmiplg5qqck4ou62926fum2hke/53653641779.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3454134c---barobikabejegi.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/17933026980.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/junefenanog.pdfIn PDF document text
    • http://minhanh.com/files/jajilolanutemagimi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160780c6f34cd7---94254912159.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb481030e---65602572695.pdfIn PDF document text
    • http://cortabellanews.com/userimages/visopuxemotonu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b677c62ee01---noforadamepukisagoxom.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/jukitefe.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/13123093556.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/xivifugitatozigotejujufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+spies+in+disguise+mp4+full+moviePDF 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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 17032 bytes
SHA-256: a6e3dc19bd61b35c6e99f75244db19a6021bd721d70f5dbfb635547ad1240ce1
font_02_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 10972 bytes
SHA-256: 5824f0bca44f8fa23a80c410c672bbe52ad7c942b76881dd3f3b896e30bd58f3

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