Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b2db168a6ffe17…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 11:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4a36937951cef3b25b7cea282880e95 SHA-1: e1b4b443040968c388a2c577b901913db8d133dd SHA-256: 80b2db168a6ffe17f148121693b6a0eb82b1c17fc8174eca1794297f06c0f73c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites, as evidenced by the URL structure and the 'link farm' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=remittance+rate+today PDF link annotation
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba661300d5---pijarifupinibin.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/jipeno.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/jukedofalapudakil.pdfIn PDF document text
    • http://leton.pl/userfiles/file/95286671147.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4a3ed39729e65e8aa14c60d67e43e40e/38379531505.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/gadajipefilodetisomojela.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/56943373708.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/pakerewenabirage.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/titepomexekevidopon.pdfIn PDF document text
    • http://rafaelokazakov.com/file/82842227195.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/33464810075.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b463c546145---40893209849.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f196201cf---kasibovoxubusifebuxuba.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/xixexepopijimawa.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/27243393362.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/zibiga.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b596567050---vugiwitotufidufov.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e676c75fb71---ruxozufagolugadanurilot.pdfIn PDF document text
    • http://korytnica.net/data/files/51947183848.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/wagasapafasuxojokusoru.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427b04a9dd---5420206331.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_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 10476 bytes
SHA-256: 83cae345e943f200fb618a03a249958a8b3ded0999bc617c88a73c98cbd22c12
font_01_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 17600 bytes
SHA-256: 53b149d7aeaed1ba8137d9bc09f6270261268372a30148f256722431ea1bddde

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