Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdee9941d5861944…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 20:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 018e81561cc685bd89338c9161552c69 SHA-1: 87695c19acf485a4209b48e65c2250de2cef56e2 SHA-256: cdee9941d58619448c7db114e8c8055cec0a6381e33a817c7468d4914e4d5799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=king+of+fighters+95+apk+download PDF link annotation
    • http://usagimatur.com/files/others/8120379918.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/narujipib.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/remimog.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/14684631415.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/44762832564.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/fukategeruputarimafowunip.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buwadopupelumi.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/84870775485.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/21159676842.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26554609171.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/vuxubofok.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/23750545641.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/da791d777d5c5b923329e03602411418/59419166211.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/39619046102.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/47422506846.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143208c752e9---49051140062.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614255a2afbc9---64378690533.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujatiriborugivezolegibug.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/pixodanupefe.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825ea95b03---lajuratoferib.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/xaveguda.pdfIn PDF document text
    • http://aeternoplanning.com/ckfinder/userfiles/files/27768024495.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/7263569704.pdfIn PDF document text
    • 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_off0000b377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 11248 bytes
SHA-256: d24953325e01c4cd89b58b50b4ebc823cf10b195d97de38c462cc74745d071aa
font_02_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 15824 bytes
SHA-256: 1ca912df7680b68f3e3fceafbc9dcd4c68436dcc09969bedfb63644d0da3426c

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