Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b3a2171053a8b9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 21:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4dd4c4a6e5e66ab17f2518f0ed470b7 SHA-1: d1ca8792fb793f8158da122aeda703a31ba00fbc SHA-256: f4b3a2171053a8b9262c166ccfc61b14df62b2dfbd26074a46c21caf7eed22da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, employing a link farm strategy with numerous URLs pointing to potentially compromised or disposable hosting domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support a malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://daugiavanthienphuoc.com/media/ftp/file/68554273357.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff05e87e66---47036155332.pdfIn PDF document text
    • https://phuquiland.com/upload/files/zopusudilirexile.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/74f1hnei5888f98cf3p5crp0a2/rixor.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/82869267532.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/6735384475.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/83037423567.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161436c417a4fc---tomatazu.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/32502936831.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/romujojuvasapinuli.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16132d66946e0c---61137971629.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/3938415697.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wijizerib.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/40181249643.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/26320102310.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/segemina.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/48627074514.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/52764038405.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/60960035011.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/61795376659.pdfIn PDF document text
    • https://bliznacite.com/files/3490532459.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/wuxagapunixorixowu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/19921895672.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/kemakeputok.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/piwilumivejugukekawur.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614590ea76868---tanut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=eat+that+frog+telugu+pdf+free+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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 17576 bytes
SHA-256: 69e201ca4c14129c2c40561857c84ca9f15a7a3db0fe003f522f049f69d94c57
font_02_sfnt_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 10684 bytes
SHA-256: 34ebfb69940a1cb22ea73b30207ffd7ac913940b7f12791edf302e4e5227fe48

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