Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb4abff1de9f8bf…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 11:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d34cd71633c1f1076870fd537a70088d SHA-1: e0b626313b5b238df87054fb44b1a6d40a1f69ee SHA-256: 4eb4abff1de9f8bfdba74e93115ca249572f756cf457b6e3cf9c00a07f7d36fe
156 Risk Score

Malware Insights

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

The 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 CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the nature of the URLs indicate it's likely used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ergakiland.ru/files/files/52021053529.pdf In PDF document text
    • https://alsharqcc.com/userfiles/files/11133725485.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/93936150232.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/39233480562.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/dqqtqp1up86pivnf2v73dp75rj/50637262400.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3c07440hd7mkg6pvba9265o6j4/joxugadokirajokaw.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/87427600790.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/66089346397.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/18232723997.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/87373789577.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/19229360921.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/wutejefon.pdfIn PDF document text
    • http://rld-carbon.ru/file/peduzezatukogino.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d403818e---wobejawabipeleronen.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b692a6cc32---gopajif.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/tisamu.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/88096026128.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c748aeba4da7b067c23666ea9e313aa/76256617603.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/suzejepafemev.pdfIn PDF document text
    • http://dnepropress.net/files/file/xinabavavabiti.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zedapokapaxal.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/zitokanosovu.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/jupafozapugotopirefeg.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0f1435465f43dca33a15be1044032e88/garirovanato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=livro+de+filosofia+pol%C3%ADtica+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_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 19116 bytes
SHA-256: 608cb4e4d29db1059896180f8724b5189165e6dd7b0b42cdf1efff50bb1a41e6
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 10592 bytes
SHA-256: 10e41f061afa975c662952696532399b21929e86c8479f2ea4b24b5b6bc06314