Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a93ecf44758af3b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 16:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2806e2b2e6fdb1c1829a6d902fb039a SHA-1: ebb9c71914290e2daf4a03d8ee679ca75ec697ce SHA-256: 3a93ecf44758af3b975cb1e3e4b5fdf77c7dcc00cf2fca3743d733eb61ab9e47
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://kesherisrael.com/uploadEditor/files/duxup.pdf In PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160830486d3d8e---doraxenawajileten.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/82386966541.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/42682680491.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/81124833761.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/jerivolik.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pebarunakevorinurun.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/gesazadalop.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/norurit.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83c217174---36361060908.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce41710b3---dorevibevurebukeluziz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gvtkqfftu9uug7d18jb1l4hop5/53031622787.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f4239d5400bc73422976172daefd8e7b/xojoxafexem.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160af1c88ea972---13695840159.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/97404534467.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/jojimugepawef.pdfIn PDF document text
    • https://ikima.fr/uploads/file/2606093921.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e46oer532g6de06et74urbauc0/rujofupapa.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/35849980866.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jufef.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/74452012506.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c2cc057e---35994180626.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/76571559051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mangal+font+keyboard+layout+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CB 19204 bytes
SHA-256: 9fb7e98b2acab5333bce1844cccca5dadeb2479c5794c771bed41d5522910893
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10852 bytes
SHA-256: 7a6906090a0c208f45f0cf5d96b62def5049e4279bc4b4d07aa3ac3f6ff6541a
font_03_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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