Malicious PDF — malware analysis report

Static analysis result for SHA-256 9589cd2dd956fc15…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 00:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1a634105bf5ac6f7ee721ef49404444 SHA-1: 932fa7a93b7ae69518766cabfc87f14cf2a0e1af SHA-256: 9589cd2dd956fc15802449f2a7bbbded63d87e3283a62f16dc1499fddca5e074
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous external URIs and links to potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://toanlinh.vn/upload/files/zifonikutavozem.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccf65d5cf---41814391354.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061408003786.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f4b07673ee89a4b91a2db270f4161cc7/62103316394.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/31daa4a9272f7e66f4eb1207f33af2fd/libajidet.pdfIn PDF document text
    • http://shopabrang.com/images/files/68108458179.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d26c1897ce5121a1add7620701f13357/xuzimoxipalub.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/refededuruvos.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/53945693407.pdfIn PDF document text
    • http://patroha.hu/file/latalimoj.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/jazizitiluxenovat.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gicsg46j7lipmqa7qf96c4hfa7/bexobidazuledixeti.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bufeluxomudemiwujidapevex.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vitikadifonirixedum.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fizemejulekusaluzotira.pdfIn PDF document text
    • https://subded.org/userfiles/file/76843443099.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/17101615083.pdfIn PDF document text
    • http://health-bridge.in/upload/file/28456862663.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/88958928982.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/30255802713.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dsqlif0834rv163783hc9d1ftg/dimoleloxoxeresarawelib.pdfIn PDF document text
    • http://195exim.com/datas/files/40693194278.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d69681e35---nivufezopijodisimi.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/92042750469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manualidades+botellas+recicladas+de+plasticoPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 10740 bytes
SHA-256: 1c5bf57b232542a73cf0759c05b080ca9f452f19fe0fcf91ab5811ae26fedc27
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 18616 bytes
SHA-256: d1bf0560e8b434c8ecc9ab41c7054f5ed915fe4030355cf4224f705298f9bf56

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