Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc30ea2d373a6e30…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 20:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9bc8cc087fc88bc18a21e09e9a155ab SHA-1: e0f7cec9238e5eb422b6f114b7a33aa8ae5b7441 SHA-256: dc30ea2d373a6e302c6ae5646f6fbb13d99cb369810ccb745a65acc0627af0e5
156 Risk Score

Malware Insights

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

This PDF file was identified 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 numerous external PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern is commonly used for phishing or distributing further malware.

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 https://needlugs.com/userfiles/files/21732973718.pdf In PDF document text
    • http://recrute.fr/files/files/76817479918.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/93341266760.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d52a57744d8435311061f4e92de4f81e/67449693816.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/47577800399.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077713520485---kidixed.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/3j10vpksp1k90vn0mbfvheet0k/riwazemulezewojodolaj.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/92884928606.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ad02375e623f43b548fad7eee40c63d/32114255840.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/59874204558.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f8a67eba---litutosomovo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faab7dbee5---zemuzususegikuzunorovi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c0f6113a48f98f9aafdd34edd33666a/45685315181.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/24959099040.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/10610421063.pdfIn PDF document text
    • http://armanetti.com/images/64637006316.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/dogalatopopubogonoru.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c5235ac5---sutixob.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9hdhbuj6f5pp489lff8iqa52j5/lotewuneku.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/47340795384.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/19410627325.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5466e1bf6---vasanazexotogud.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/839632794.pdfIn PDF document text
    • https://ptogel2.com/contents//files/82543869635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=descriptive+and+limiting+adjectives+worksheet+grade+6+pdfPDF 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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 16652 bytes
SHA-256: 9bf3210210fddfc8326b043f32f1b3d2f380f2c60d3f137b7b26bdc8dcb835f2
font_01_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 11612 bytes
SHA-256: cabc3d8fe4ccde88756f9185f231b40c7e5ff663ff1c085a2b914f391565b893