Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45e9fc0047c152b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 14:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c72c1488867ae617394bef6460f46d0 SHA-1: df2091e4c696efa777871b122c00513da20c38fc SHA-256: d45e9fc0047c152bd125c7c615ad0006347b537fc36728ceac794b1ba6104b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript for malicious actions, such as redirecting to these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/424b4232477f3beb41c31acb40eee679/3554398755.pdf In PDF document text
    • http://ccsilver.kr/files/fckeditor/file/152800500661167e85e5947.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8bea77036179c54bde816a7ff00c892b/ruvunoxupupevixuw.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/84250794133.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/rekuf.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/69280923634.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/xolozabemovolabiwotup.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/nenor.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/xewezatuwisito.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0bb20a5d---pigig.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/25024150e5a748ef876696b03a1488bb/soxesuwenafororununo.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/jobemuz.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/40144413344.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210821_071834.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/52996514781.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/657e2a184ba928fb3ee6b133eab31407/fosapidabowegozewudison.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/53674882862.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/9180357417.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/vumonivopuvapaxoraj.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/38457177791.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/73503637371.pdfIn PDF document text
    • https://digireg.cz/upload/xonifukovetulofobinuwowez.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xakoxidedelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=atomic+absorption+and+emission+spectroscopy+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_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 10972 bytes
SHA-256: c045ed05eb9f073b405c208be21886ca1eadad8d2ff9dbed6c7544dd211cbdd9
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16704 bytes
SHA-256: 13fdbe8b92b5362643172dcc622f7790cd9b1d6ee89a7dec26705e48b918bf4d
font_02_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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