Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4470684d9be2aa…

MALICIOUS

PDF

99.7 KB Created: 2021-07-23 16:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3d97de92f40cb841c5f0f6716c9b347c SHA-1: 7da3118f97d32722be2abc6eff1037158d98778d SHA-256: 8f4470684d9be2aa6b4b8afcb89cbeb6f8d537760fd2b92574f8e3fca1480938
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through a link farm. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://9meclinic.com/ckfinder/userfiles/files/jibelunenagofevo.pdf In PDF document text
    • http://boxethai38.com/upload/file/xemut.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/dixeduleguwed.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/morenawiterebogepefas.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fcac9268---54199796870.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/86986769011.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e4a4840c---47201232132.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nukopij.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/faxubawejinaveb.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c30406ff9---26384256589.pdfIn PDF document text
    • http://salkim.com/userfiles/file/lubewibudevumipazorido.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1be27bb95---tovizetemojib.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794e1ac5b90---5601458486.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2b9993ce39016496c7a43d1f683a4cd6/47347955037.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/gibarifesigudibakidon.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/livagakuposivug.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/71003926499.pdfIn PDF document text
    • https://andrejc.si/files/file/pijegowulawagawoletelekit.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/dujedefibolifoforujek.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/19374779537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=geometry+dash+hack+unlimited+coins+and+starsPDF 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_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 18780 bytes
SHA-256: 125dddd0dcbb977df3939dd24343d65a096a4019266b0736492a04aee1550397
font_01_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 10980 bytes
SHA-256: 8c137a2e23e264d563a15b89aaf3eaf2df16730e984c46c8f0b8d867cd32a885
font_02_sfnt_off00015d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5D 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00016591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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