Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81c41a5b4402d7b…

MALICIOUS

PDF

111.3 KB Created: 2021-09-13 09:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d34b173aa7ffc4117de48352f0191763 SHA-1: 09130855a288b3c399f3bfc23fcf0e85e446515d SHA-256: d81c41a5b4402d7b35119850ec08c41616eadd1aefc7c9ae748ea7ee15b8cc90
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. No scripts were extracted, and the document body was unreadable binary data, indicating the malicious functionality is likely embedded within the PDF structure itself, possibly exploiting a vulnerability to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dkstores.gr/userfiles/file/44375382739.pdf In PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vebabuvuxemu.pdfIn PDF document text
    • https://digireg.es/upload/58783482622.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021913107418318.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210907223516.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/81710817736.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/paraxezosewaveferad.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c594f655ec---jelakexugovon.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/jekazijimasozed.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/00dff2psoucpj2180gi12u9vfl/guvadodopovovurora.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/53605021242.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/puzikikumusumuro.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/64920068321.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/vufefuzedepi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c867df564---36382791718.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/64045599100.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/3987840836.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/14823326185.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/sugoluwuwabenegu.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/gubavedixub.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/11326818513.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8177a69a---70841301127.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/23317928396.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/76266579105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gi+joe+retaliation+fireflyPDF 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_off00014b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B44 10324 bytes
SHA-256: 4da281ed93942f151a23e95e782110610eee5a34800d3549eef4e7068e1273cb
font_01_sfnt_off000162a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB4 20064 bytes
SHA-256: ce7239f0a3edeb396af6f019c9e28a099e2963d9825b5ce9da23e1cba71e561d

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