Malicious PDF — malware analysis report

Static analysis result for SHA-256 189d3f40fddcb0a6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 11:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff365106104783a509dbe9482486a034 SHA-1: 583ab7c62e2e74ad87e53edecdde3d78a597c9a2 SHA-256: 189d3f40fddcb0a69f2ed59ef0b4ceeff7d65f0cb115cd4bbded202fa036793d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b396b9573---73628543256.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/42629888400.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/wogexotaku.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/25290210484.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gusisopiva.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/46bb9b27fcdf8df34143cf3f19d76b8f/45877471084.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/28348877247.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0c93516dc171a98fcb1b36112264a985/89371159149.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/92134329706.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/nowivapabuzomur.pdfIn PDF document text
    • https://southafricapools.com/contents/files/fafokasisuratane.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/70943599448.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/xokamiliwemewixiwudebewi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/gewajapupogikanulina.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/16799499002.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613291e5e162b.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/40862988413.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/55788918233.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/fewuw.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/lizofezofuwuvulugepazinew.pdfIn PDF document text
    • http://zl369.net/userfiles/file/wemiwugegapetikiluv.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631864113.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/13129107568.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/62094267649.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/ranumudolemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+games+on+pc+bluestacksPDF 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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 11172 bytes
SHA-256: ec52adbda7217817ffdf6a3f8754ae8dbcfb0a6401799248c58673eb52c38663
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 16804 bytes
SHA-256: 4c78d67b037cc6db8d1517bf093c6fecd6bb1d84a42120ce6a39df8939d0faae
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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