Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6d4622150a0ce7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 00:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddf8b0e7bbef996ba07988e4777cde63 SHA-1: 0dcc8e136009a1960cec82f397f0e461420f2aac SHA-256: ca6d4622150a0ce7feb6027012ed0b6762f735d528cad240e1501972bf4947f2
164 Risk Score

Malware Insights

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

The file was detected 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 various domains, many of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading potentially harmful content. The primary attack pattern involves directing users to external sites that may host malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=crash+team+racing+mod+apk PDF link annotation
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/45327613425.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/53446814990.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xosanusometewezejugexen.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e67d9dea1eada008c046095b08737423/27290309505.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/81264521171.pdfIn PDF document text
    • https://ismart99.net/upload/files/lolisexinotavodigufifojed.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/91039766109.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/vofefusujibisodagubu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6999f12ce---6522388367.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/1211715433.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/71178367023.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138631b4048b---70811325138.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/wibamipufejawoni.pdfIn PDF document text
    • http://www.depomatrial.com/file/nubujomisilasokuv.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/71860239538.pdfIn PDF document text
    • https://redac.ch/upload/wikoxak.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/nopaserolobubiwi.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/46219133625.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/xisodefatamefegavixoviwiv.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/vawubegora.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/91558079867.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/867479ed7ee30450b540b19f730af863/xusizonuvofipevi.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/20141071295.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_off0000bd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD84 16580 bytes
SHA-256: 370056b18209969e4417256ad43cd44c2b89b434068c3053f14175f2edb16b86
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 11040 bytes
SHA-256: 9abbab7193e87e4285847f0e683c69c2133dbf0ab3696214da3f952c9e7a17c5
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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