Malicious PDF — malware analysis report

Static analysis result for SHA-256 633d724e9d649e2d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-06 19:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45d05fa6d0d896aea595bda186707d17 SHA-1: d1ffa3d9a7e79c5dc19cf63aab0a7e0403c101d7 SHA-256: 633d724e9d649e2d87d74bb8ef45e04ac005d9b7eb47eecf65cd23c71b3d7479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit user trust and lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://doo-san.com/userfiles/file/20210723152922.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5fcbefe9ac957850249fc3ddf4e074f8/86541610503.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/84963017163.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/11804949439.pdfIn PDF document text
    • https://mimpidia.com/contents//files/fezogakidomiteliz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609935eda3fa1---lejujaxad.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/60106f0eedab1358c8a7bb36ce8a51ce/4748486285.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gupomogavudukuxuporepini.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fb6519e4---rejubuz.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/94754378082.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/094ff9b862d34674e5750996f9df3f5e/vatizulofezelawapitogok.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xisobizedajufowuxavuga.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/1608094973.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tqpamkeapuvtge7p9ufprif3kn/96765306736.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lijuwumiboleletu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e11cd40c1---dadazo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/1cbenchl6ovdueql1dc5debkk9/nexonimaxaje.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cpgm77389k6mmag2igt895npq8/16939294286.pdfIn PDF document text
    • http://skupka23.ru/upload/m/sivubodekivarugomosaw.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/wejexu.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/lakiramefurivuxozapominan.pdfIn PDF document text
    • https://people11people.com/uploads/File/ziwakanuso.pdfIn PDF document text
    • http://exima.kr/userData/board/file/5197004143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=semiconductor+spintronics+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 15096 bytes
SHA-256: f4d079764629f3a5f152242d1d1a5cad1db92848f6c9303c8e84d02714ad250a
font_02_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10748 bytes
SHA-256: 1fff141ff7a13ec3479327039a15709b4c50ff9236d639d89fd6502322d1cd93

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