Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5dd4a484ca026a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 02:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 949f1961a8cab33d6f5018d25e12c583 SHA-1: ef473e05d17b128b207c13a82a4108c7c7b843cf SHA-256: 4e5dd4a484ca026a54b9c29f0054bfc30342eebb5b40798d013c8900102c698a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. These links likely serve as lures to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://deltarents.com/upload/ckfinder/files/tokivusamek.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e2b915a03ed895e139a0399ae928cf62/rositodu.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vebujijajulopufezilirej.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/rejolibobu.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/82976051020.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/40822564850.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jimil.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b2b4bf1c---73973417405.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nagonamif.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nukowasotometakase.pdfIn PDF document text
    • http://web5gstore.com/Files/files/54692737510.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vafisinizigejevasuzito.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f8a4833ae---vokovatozusexotugikedevi.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/95298882441.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/remodorepogivex.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072002331773499.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6968f187---jifinerisugakebozaduz.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/31411538895.pdfIn PDF document text
    • https://flomogroup.com/upload/files/24685999826.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/62855676042.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e35f6c2dbd0---65226070754.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabc2b37d29---54236629083.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2nucpick6g53t763c14tnd2921/jenusinivogafadojun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+would+like+in+frenchPDF 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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 10376 bytes
SHA-256: 0a667caf2374187614ea3ef6f83241c668afa4ca455944b8dfc78208a10bb5da
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 19856 bytes
SHA-256: b781bbdaced6eda50932cfa5b9bd126e66c81b98f160c5f47753920f7287ddca

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