Malicious PDF — malware analysis report

Static analysis result for SHA-256 646d9a2745a330e5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 15:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc42d6aeb955c192c0c113b43a5c540e SHA-1: e8c5cee8e9edec393ba1da1956f9dc6398e6dc71 SHA-256: 646d9a2745a330e598ef0b767e51e09dada94658959dd2421f180e0ee52061ca
156 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 various websites, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically highlight the nature of these links.

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 https://chcial.ru/uplcv?utm_term=tests+for+convergence+and+divergence+pdf PDF link annotation
    • http://endemic-capital.ru/uploads/files/14000931076.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/35015260788.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/183ee36faa7ac65bf901d16069b3f032/roguziniruxikajava.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0694e6bb94ef90a0b5206ce442521775/norofareximirini.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/89306891090.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/zibotatogot.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/zazuletetedivodusenagobe.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/31133220755.pdfIn PDF document text
    • https://iword.de/userfiles/file/86563569571.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/wimepopuzifuzipa.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/16628608973.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090137639a34---89050758188.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/92678361877.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae3b35614---28267591971.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23885517627.pdfIn PDF document text
    • https://ms01bet.com/contents//files/80617467998.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1be35ab83---11597656886.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/dotasabanafuzi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b021f1cf---95203403933.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/10012276898.pdfIn PDF document text
    • http://cosyromania.com/media/file/mixab.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/99462862716.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/sukuvubominolifaxugit.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/rilapaxutorilerukapebonis.pdfIn PDF document text
    • 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_off0000cff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF7 19664 bytes
SHA-256: 6b9dc6081db1450233aca66705a796b8a96da0291652e6536db5a86a7b94a2f4
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 10776 bytes
SHA-256: 88b7acbbf7af6b6da50875962e1526ab11d86505d59464c30e869c17636cfed1
font_02_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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