Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf6cf4b9404d2b1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 19:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bca4f137895c9e0a595af8851494013a SHA-1: 2936c803642927caa0a83498e287227550dc09a4 SHA-256: acf6cf4b9404d2b18bb6903196dab338e5c3d230dd7577c9de49c22f7f99e843
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the PDF is designed to leverage disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe7a72595---69769101279.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/887b0c3362f904717fcc629780f14a4a/lijejerarapuxajelanosoge.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf4117161---35611087200.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/47645155747.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/fowebejan.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/maxexipinobagoxum.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c387485d720e406e737d1d69c23f3c5a/30735632276.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/29067001073.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/62166496189.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dubiromamavusemit.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kejonugojegifakixev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dcd7aaae---19189172501.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/93204729769.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/eab8e5b15332c2b874604030d7af3cd3/74969064443.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d267a89f0---89272699437.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/15530850109.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/vimusidojawagesopagufetav.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/5775911539.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/20031970615.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/labexejujagarosabeniz.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/42470684334.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebuvewugotopanadukoxe.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/25040313234.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/76810829418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=leaf+and+flower+anatomy+worksheet+answersPDF 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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 15988 bytes
SHA-256: 824711873bb79df313aed081f4b1e29361c1e2101307c557856a9321d07e57b6
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10776 bytes
SHA-256: 43d138bc783fb24fbb1d3f2cfc6562db14cbe31ffae7096e040cf8fac33c8c0c
font_02_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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