Malicious PDF — malware analysis report

Static analysis result for SHA-256 91550311fe11c2de…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 17:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 704273443e7b530b4a47c9aa9a7dbb6e SHA-1: e2cda235bef3bacf46c92d07adaffd53f96e73b4 SHA-256: 91550311fe11c2de8c00e8b7deed427f3faa9013dc3d1c7301a7306435da1f78
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://zjhywt.com/images/upload/File/11795415852.pdf In PDF document text
    • https://verandapattaya.com/userfiles/files/99951936996.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/11963469994.pdfIn PDF document text
    • http://inistor.com/ufiles/files/tamamigajevepuvi.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/81098328897.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/liwilubor.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/72300693204.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8d425c6545c87bec156fb76c4bd9c940/fetomodosonot.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/sazafojitijimufonoti.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077e30258d2c---14172740947.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/puvamenitobesono.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/43558190236.pdfIn PDF document text
    • https://thepainter.asia/upload/files/mezuvajotafuzepezu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zeforedifeli.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607974cb95f96---10169588502.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/51591685642.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/8715cd7cf3a4d3e5d333f4dad02afd63/6981121949.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/jijiju.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cec2c82e5---86402497606.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899e9b2f04---56830903807.pdfIn PDF document text
    • https://sealskinz.ru/files/file/78692230366.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/70231395384.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/lupazisoz.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/vinemusilokavalokelabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+particle+of+mass+m+is+suspended+from+a+light+thread+of+length+lPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c84ce7ef8c6651cfdb7ed5b91b76a908/xitewafodivugujup.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_off0000b99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 11148 bytes
SHA-256: 4a5b18ab9e1fcf746209b1b66b70dba6706b7880b4781ef3478fbb3ebc216bbc
font_01_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 17476 bytes
SHA-256: 6112e1c4c3cf0ca10397fcca503347eb02eac58a5223658141a15c11139c03b7
font_02_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.