Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9d54c0d449c194…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 22:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bedcab78e9149a7348e2b9b8c312ada SHA-1: 9974ba611e7588a2534197064e60eb8e7a293c31 SHA-256: 1d9d54c0d449c194b94da8434d911239f7acb7f74bc5f4eab135d0ca89713ac2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URIs and a link farm structure indicates a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yonseri.org/userfiles/files/jutagij.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613294587ed1c---devujebezoso.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/natetenetedexovugi.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/wofuwoxadisobuxozele.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614443a883cd1---wukibuga.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/zowedadolakubogufes.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/bipugokopavojazagewivixa.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/vitamowivameb.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/14025362083.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/23280695897.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210908134440.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/37224765777.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/12311103022.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/puzorasotasupowuderimox.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/36086514393.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/7389964096.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb9f3faeb---29593710693.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/30049629294.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/nobevarurebologirerik.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gubisi.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/26537662397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=syinix+tv+remote+apkPDF 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_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 16704 bytes
SHA-256: 49488ee1a72ce4d06b3431bfb2f0b86b8cc184edfe1754595d7b6ecdfa903523
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10648 bytes
SHA-256: d691f69c92c9c5ddd5a72b13949941e5bdd7a64abc61d025864e9a614bd0b656