Malicious PDF — malware analysis report

Static analysis result for SHA-256 827f65b566533ab6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 02:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f34078132abebb3a53a4d52bc7f56e7 SHA-1: 19a23e2b1c5824f33daf59855d2832748d9f593e SHA-256: 827f65b566533ab62f9ac77bb643a6a4127371ff478701f95679ced5fe4fe7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e546106e279---fudopijapijuxokuserusopip.pdf In PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/15179322503.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/5974631299.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/34296910324.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/bipixunapivu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xozoza.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804411d74e2---bifuzavokukipanelimefikup.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/95691663164.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/xomakoxi.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/junujafoxezilew.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zureguxazozesogafumase.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/bofaparokimebiv.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/58574098035.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3b9192374aa23ad62fe32897645c6b3d/36313929900.pdfIn PDF document text
    • https://domilot.com/uploader/files/nixikakaset.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210820_111321.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/tedinumiguvagep.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/zoxupurunesanerixili.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/9415584284.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210730110751.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/vabowibelexunapusa.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/jesixovomiteje.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7bfd0e6b42a5ef25912dadaffb9c1539/96560063851.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/12576659919.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210730154747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=signs+of+liver+cirrhosis+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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 10780 bytes
SHA-256: 8bfff6f330b2ef12dd423a7ffbdb6e8e7fe92e31b2782a0439ce0c92afcc4990
font_01_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16824 bytes
SHA-256: 3440d7f9bc754a31c40fcaa546ec67ef0c70523b3ba3680e950739514c0cc30b

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