Malicious PDF — malware analysis report

Static analysis result for SHA-256 4471c9cfee460299…

MALICIOUS

PDF

81.9 KB Created: 2021-09-28 11:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7acb3a1f36edd0b19fe32081d8887e2 SHA-1: 9deb3405582383c51982351cd828cbc8be507747 SHA-256: 4471c9cfee460299efc5b943756e3ffc0ca2939c246617c118c9d0176a564052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to facilitate the download of further malicious payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://internet-trade.eu/UserFiles/file/nizusir.pdf In PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/kodebozexetiralixudivuge.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/vofewidurinilalizi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7244f51f---52950531433.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/pukojekijarusovizabok.pdfIn PDF document text
    • http://allycatering.com/userfiles/61465658450.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90de93f5d---57758717240.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/67075345178.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/12896574551.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zekatojuvoresujefedalab.pdfIn PDF document text
    • http://stattus.com/assets/file/27983135569.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3116340f---wijagolitifaroxokux.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/gipadoxubabidaraleka.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/gunipebatuvimesusaduvi.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdfIn PDF document text
    • http://aven.su/userfiles/file/1578138876.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/91450210313.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0983e8ec4c5ad613c1b2d0b6af9bc0d8/tovuwuzizadedo.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/92621459180.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282877060d---zubibas.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/1150821438.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wuvofakufifej.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/56665167686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+quiet+place+2+download+in+isaiminiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE10 20288 bytes
SHA-256: 940b88c62b9b22fe50beec439b611149b1ef5593825218730d4e015989a718c2
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 11008 bytes
SHA-256: 4a9205fdbc675fa549ca18c250c64c2fddbb541d8b18ffac5222b90fb9a8bcd9
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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