Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30c5e1105cf4cb2…

MALICIOUS

PDF

81.3 KB Created: 2021-07-28 04:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3ce58610f7da111cc4bd0a2ce8923b1 SHA-1: c313ca5af98ca2244a2199b079c55f0cd72b4f2b SHA-256: a30c5e1105cf4cb2e27ccc94f2231c8527016bcdd99c984f5aac4ba0bb12efb8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves using the document as a lure to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://addsfly.com/userfiles/file/44832602849.pdf In PDF document text
    • http://www.polni.si/Images/files/58521239892.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/xozisa.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/1389319716.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6583e910221ae0ba8efdf8e0b11ff020/wagiju.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/51944247477.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/76390298237.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944af3b8e75---wixabajizerefojimulese.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82fe93d743---sokamoriwepawebiletuvo.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106180204553569.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/59934649728.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210523134917_8b7ki8.pdfIn PDF document text
    • https://latework.cz/soubory/28818454617.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/dafuxinetimemikidetubawe.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f52c4faa---deguvipekapisisugamo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cce0a2d2a---19153642334.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m1h6c2qc7ii9cade9ejbuu1ldr/soperixixud.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/semezobabexolem.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/44113088428.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/jufezibirub.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/zirid.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c886f7ef73---sajagekajajinaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=malcolm+gladwell+outliers+francais+pdfPDF 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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 11144 bytes
SHA-256: adadaf49451c851c12cbb6cdd7e649d4e5233822544332f5947483e8729c77fb
font_02_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 19156 bytes
SHA-256: 8a04b938c69b3b1e6efb629fcbfa05a94a411cfe6808bdf64d12b8bdcd766c6f

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