Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c58ebcf28afc86…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 01:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16a6e2fb92bfcee018639f63fec15969 SHA-1: 18051ed121485e09a0cd9814577ef6cb7054e722 SHA-256: c2c58ebcf28afc869f8cae3f10d76aef211a374f5448d6589b16a95d3a90e7ad
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://fcv-bo.org/data/fcv-bo/userfiles/file/tubarusibemuwevozujitetus.pdf In PDF document text
    • http://ekotop.eu/userfiles/file/nitixif.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/werik.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3a0a1cf6a---nokubusevuzudoxovexewux.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/42606843129.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/29469946240.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/71975640863.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/komose.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/rigiki.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/dezema.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/3279155776.pdfIn PDF document text
    • http://ipceurope.be/assets/file/8287794839.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613273ae9f50d---40472630627.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/fufamoduvetepukomuwejarob.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bc8934ee22d71c74b21988df88b93fef/37739446878.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/43653325532.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/nijuronemati.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614256ac7d289---34960097744.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/58498948587.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/zowopinul.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/sadakexalor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=beyblade+codes+surgePDF 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_off0000aeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB5 10656 bytes
SHA-256: 0eda14e5a8676a14275880e253afbb8199603286e9b90f80ab61ac6436127a85
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 15980 bytes
SHA-256: 4d0dbca5e7040de934e9b5b8a32f233bc0f8f4f03c9e92713fcf8c42f51a3492
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1