Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e473b911d3aa28…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 21:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e47dcc10e8445c3920a7d0155c0d894 SHA-1: 36c587979806eb66a0233576c78b630928cea070 SHA-256: 51e473b911d3aa28975b0a4d41aff834ef91ef14cd40ae31752342e455a2957b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised or disposable hosting. The presence of multiple PDF links, some pointing to potentially malicious WordPress uploads, suggests an attempt to direct users to further malicious content. The 'SE_CALLBACK_LURE' heuristic also indicates a potential phishing or tech-support scam context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://at1apigroup3.com/contents/files/kajipigi.pdf In PDF document text
    • http://studioboscono.it/userfiles/files/91396038289.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/gusuv.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/35228040426.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/bovupab.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fee9c29244---3346701197.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141353b88d0a---76914894661.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1615132931cd82---35745950903.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/80703521778.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/naxipaz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/36857012200.pdfIn PDF document text
    • http://congluc.com/upload/files/gakofiboparulugunulajuf.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/37168749132.pdfIn PDF document text
    • http://totoumi.jp/upload/file/pofiso.pdfIn PDF document text
    • http://lex.tj/img/file/54618487940.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/51523856733.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/80857769038.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/18257632004.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/fexaxobotofobexegosiladit.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xetararolopebofovezi.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/47335338642.pdfIn PDF document text
    • http://skisun.it/userfiles/files/15103500254.pdfIn PDF document text
    • http://synowka.pl/galeria/file/vilafozosikesomilolesorin.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/32217959324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+platinum+citra+downloadPDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 10788 bytes
SHA-256: f8630801f4dea735f785de95cd6c129b15f794f6e14e3a5174c97f6d74d85be3
font_01_sfnt_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 14680 bytes
SHA-256: 1026e416a7afb763b8c35bce5ce489703918bec6f9453c20992b245821630ca1
font_02_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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