Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c421bd1790fd825…

MALICIOUS

PDF

108.2 KB Created: 2021-06-26 08:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dc19bdd9267cb84dd2c0d054b0bd7e2 SHA-1: eaba9325cec630402f1db0c17522065dbf04f040 SHA-256: 9c421bd1790fd8254a4bcc8ed9300a181ba4fdc73f5753c750ad06359ee8ccfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6686e7551a---18522116351.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9c400e219357f56810ad908aaefc6b02/refogasuwali.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a950ab35b25---wosuwovopit.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/vudabono.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/20855420886.pdf
    • http://panteres.com/files/files/16773052119.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e0f6f8a3---32144728912.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/g6mljt5c06a6ma6ltqbter3ij7/nusitanigokesanaferupibu.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3c51ba43---nezedekagezixitala.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9c5affbd9e73f8a966674a37c6740c41/kukibilubinowimasasedom.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/wisagosugiloxajidudewore.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f72da3ec---6186455005.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/9640933243.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845da5561a7---61031357439.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fbfe5c60b---79851538253.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/xulabudujojiwopirawed.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8fc17a85d40e1be12e5d2f5f21f2ecb8/41549619804.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0405371a9---jujanaduvipelunufituxelow.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3e4a12936---relanozibozitabigogewewe.pdf
    • http://challendor.com/fckeditor/upload/file/9436159623.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f9d4fe86---32637056023.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c25daf506389b7358a5920299178bb91/fotowiwipofipazodibepu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ujsur6f4kl4l5iscfj8pg1j214/gelesowosepebad.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5d5a0a8e---kifeza.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/k4ig15a8s887vi48virvt60jm4/poworuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=radio+waves+are+electromagnetic+waves
    • 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_off00013ca9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA9 16792 bytes
font_01_sfnt_off000154c0.bin
c831eef79234a4320dde3e7463b02af43281b2d3d6abe3df735a39f99ec8f05a
pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 10912 bytes
font_02_sfnt_off00016dd6.bin
e4d8de79e261595a7ab515ee38a0eef896ae7f518acd9506dc7111901fa633ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD6 20680 bytes