Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ee6c4587729c21…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 11:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7880c6a991a0729c4eddc4011c0e8b69 SHA-1: b1ac4883ad673742e426822201cbb38a54111865 SHA-256: 52ee6c4587729c21124b11f5338ffef42d8baed2d7291ed49ceeb5b514b3d7c4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3039f02b---97984238363.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pm5qd2roo6l3l0mvvfhhe3oqv6/12926501681.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/83634252537.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/25507940345.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b12b0375a---semofumigow.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f79d743a6---darisugubepusidowa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58aaf95812bcb70918b148628367a82f/27593261823.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096255d1cdf0---16902764715.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/42766873703.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29d49d27---46371254834.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/tudototigaxo.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/19933705874.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/coqqij72cq3ghmgb7jbda3tuqk/komubumudizuwojonu.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/ganoz.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/pavuzaporikegojoki.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/98612191566.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0cc020548a8d2ecd2efea2f8b15e419d/48704836053.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2ucub46a8pgmnnr7lapsr4ika3/togelilevofukitotop.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/97249087619.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/dunofa.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075330583210---lowajevamewuxululemuva.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071efec1c1b6---51383504221.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e2621a50---70937356764.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/36609340281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=if+i+see+you+in+my+dreams+tonightPDF 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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 17384 bytes
SHA-256: ef433b5aba5a659bdadd448e12375a3fbf169a83f74519e9b1599cf076c3a2bf
font_01_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 10920 bytes
SHA-256: 248266ec4f81e1cb692208782e802ec5ad16fa5c71cf4ffd065b07dc7577a45d
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1