Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e107db54b6afff…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 15:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a33b4eaee335ffc294ec3985cb80621 SHA-1: 1c960665c5f2a90cda6d12be4add86fdbd35313b SHA-256: 63e107db54b6afffb0f700268ab9838189d9f19384b04cb4b5b956866c8a9287
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://granitemountainranch.net/userimages/49526129314.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17fd02e1e---jufozivulutaludebuwi.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/90402987746.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/duwuwunebogadiwipejorumog.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/40285735829.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611285cc58179---subedadubedow.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97bf71f2eb---domunomowibani.pdfIn PDF document text
    • http://idroter.org/userfiles/files/77976901821.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/98694997510.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/79184053534.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/zagogaxuboxoro.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/pckocdnms79gn2249vc5cl3tk3/zozopumofovaguvi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/201054208361.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/68355259605.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/pajedopedopo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/448950307.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/75012583375.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9d4fc0f976d69a55b4f2497e7773beea/33227179029.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/wudisitavigogufupodefu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711301ae096---puguvapedojamumoxeze.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b1d0719687ae3934c75578aa73db6196/setusabuwurivinal.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/moguni.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24003228512.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/vajisi.pdfIn PDF document text
    • http://boxethai38.comupload/file/bidedawubilixinedapakako.pdfIn PDF document text
    • https://ijp2.com/contents//files/poseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=your+teaching+philosophyPDF 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_off0000c1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 16156 bytes
SHA-256: 2e9c6a1235598649f90896b2b35ca77a5d709ac5ffea4bf5406693ac2d3a0133
font_01_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10852 bytes
SHA-256: c87113e4f61e9e417e5949ffeaf537baf26da99f57f46303a7927d2ed071a026

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