Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b9ab0e8c5b2929…

MALICIOUS

PDF

92.7 KB Created: 2021-08-25 21:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 758db8ddde18434a6283c8365e7b6636 SHA-1: a36bd61496dc44d815bcd3ee9eb720d28bc6c479 SHA-256: 54b9ab0e8c5b292935a436b3a4556edcc8018f9d1100221097d3526cc108ac26
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8a29f3f0---77423913408.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933f6be4526---5860076605.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085529ab0880---25474583675.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607447863932f---mupalelul.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021081008440919.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8cdcl6vm52i0gci402gbefokcq/pijejulaxeti.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/96095235674.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/54654706655.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/10659835474.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/22930066256.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/nuzon.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/miluredinikijemopuzibubi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/mozefakiparesiw.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608818120a4e2---jiziw.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4732351f59d6c2b2dfe001174573bbfd/lezezogivifore.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/28083514253.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vubafuja.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/41884414030.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/dizugonobod.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/76253433658.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/7603296637.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/walevem.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/kiziwokewasinupesepuzot.pdfIn PDF document text
    • http://unityproductions.com/upload/files/63532590676.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/wufepunilezidoxefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=online+hebrew+bible+with+english+translationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 18940 bytes
SHA-256: 0b301d5fa90cc0a9bbec89e9f92ff8e1af7ea4d2a9ed71f3664d84542706a200
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 10640 bytes
SHA-256: 33413332559a0000bbfae8d40a9a4acdf665e790db1db1d2567ef50ddb4a42fa
font_03_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 18428 bytes
SHA-256: 277d009a16806780b1cd850a4be6521f274f67742c29fe724c839d0b47dd8d40

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