Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1a8e5b1d2a02bf…

MALICIOUS

PDF

80.4 KB Created: 2021-10-08 03:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0657c2b1c09a5f10b87d20ffcee03934 SHA-1: 71eb172111566cdccf15d57b45c45c949546a3b4 SHA-256: 3d1a8e5b1d2a02bf47ee8cd0e2bfac0ab64aef79f89f25202b3d5377c4438f1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4527

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rzfmuhasebe.com/userfiles/file/98194763073.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5d2318b8d280cb44375026f5adfc9cc3/tukesubovapoduxemaxeso.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/dezisemuvitebipamovud.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407b85a8172---bapasanuwexilosopakiz.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a187461b35---jazafedopuzeraxovu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d6a02aeff---89848832703.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/sojuseva.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/jutavidatubadazegu.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/nusosetanudawokox.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c2ac8e08---wipozodezetazidomozam.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/ruvilujoxesurose.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/palutimujenokepewatuvar.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/72909207584.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/80693338237.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1637409362614f01eb04c85.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/89757103489.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/7724074414.pdfIn PDF document text
    • http://melvin.cz/data/94921305976.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/6877935527.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/51851318850.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/23215162714.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4cb1e25d4ccc8dc7e96c961d7c2a31a9/40577088706.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/retogolosisokenutirure.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/62471376535.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/62926837759.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/mulavoruvobamoxadedadex.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c1ba0ed0fd---jadazatap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rock+bands+touring+in+2021PDF link annotation
    • 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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 11036 bytes
SHA-256: e2d9550a64188f01a90ca314bbf125c8104a6479eeee81846ba6b1d18c5970b7
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 19800 bytes
SHA-256: 561d61c72065f386b21a1fce07e8bb5a4d1e252e95731aa8b6530760589dbea4

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