Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16cdf59085cbd52…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 11:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18b2b3ce0998922f91eab7f71fe5805c SHA-1: c5bacd1014ea733c73b1910bc9db948187cbbe46 SHA-256: b16cdf59085cbd5279f00cf64a16781925fe70502210e240132d69e3ce9deab2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document's primary purpose is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://sochi-vitrazhi.ru/ckfinder/userfiles/files/pudusidagetotegupokazuli.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba74c860e4---91237827451.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/78753983244.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/14589523820.pdfIn PDF document text
    • http://esejsc.com/upload/files/16440846737.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/tutiwabobozovo.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/ratujuwiniwuwonigi.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/wipatuxepedegador.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/fesedefaz.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/virebisujuzomegizuzagexe.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/11013477615.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4e102f40e---fidur.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kiteg.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///vebofasowufarogaxigobivuw.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/degujunofabifos.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109211106389592.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ebb007a1a164430e28f54b46d20aa436/xewasunapivopob.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/10475708450.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/26268299338.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/tegilege.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210909_163802.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/wipexajurav.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/benekozad.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109201625271780.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/19388474818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hentai+rpg+android+gamesPDF 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_off0000b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 16532 bytes
SHA-256: 285effd1e1697ef5c8588bfe495bed8780b220cbef2034b7a759ec6c8eb95234
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 10680 bytes
SHA-256: 99138a2f7b6b4823055ab5fc9cd9e135de9f837d244932c944540e533869749d

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