Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec9c7e633d3d4d6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 09:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca488fa64f978f8569c81f18b9871043 SHA-1: ab9e64c945486e5f0eb5e022ce677e373d5c4315 SHA-256: eec9c7e633d3d4d6fe6b8d4877ce7c3ee71c4b5874bcb0cc74a84e130b900251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to these external links, which may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3b83a83554dc269272b9ed5bff2b834c/92566116126.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f52e1d002---wujes.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5aa5dd78e---bebugorokijotu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/49206691207.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/99221355123.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/52462942642.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/14762458961.pdfIn PDF document text
    • http://freetds.net/userfiles/file/63041826256.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/mitepewol.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b335ddd50---83841891679.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/kevozoludanomowosinewanum.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/fugobene.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a6763682a01a34d9cff4efaeda6f0932/41951032974.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6a12ea30a431ba6612e29146216d048e/poweganu.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/5929358194.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/83839096808.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/60497500747.pdfIn PDF document text
    • http://gabortech.com/admin/file/19469228294.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/405f1f6bff0ce0ee77b827f59caaee74/92223913905.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/q7dmvuqglb1kbtcij8ne9tn445/31265273025.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/jirikitibesepexi.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/96967716037.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/nugudojajelevolevuma.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64cd2ce64---44599350566.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5557d875e9---87961181089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=derivative+market+solution+manual+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_off0000b4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 10916 bytes
SHA-256: 74ca2dc1e10358a4e8f0d00fd1bed6f34445faf9f7d6a0b81e29cc0b39ef6d53
font_01_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 17172 bytes
SHA-256: 3098e26e33142a18d1546c7c4a750a3837254308b5222283fca8c12f614accf9