Malicious PDF — malware analysis report

Static analysis result for SHA-256 63165655fbd501f8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 13:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f13f0954fefd45fa6f11b5530f7ef78 SHA-1: ccc3ba94b6d5702d14f06c78d48f5a4f85c825fc SHA-256: 63165655fbd501f89969d4e88eb9ba80921c5220cd067b3a946d3b2528f069df
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://barcelonacentremedic.cat/files/galeria/files/vurixur.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d94e96eae---nopivowasuwuzakibemu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b16d06e7b35b99ca4c32cbcddb4b9a6f/wejevigiwuzurinupu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8f67899e6---46884401669.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d64h8n94u9rtjkmafd5kihtfq0/wuxugavuf.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/bitologat.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d086dcb82cf---nuxorixo.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/zuwenaxozurig.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/30689307377.pdfIn PDF document text
    • http://ge-mak.com/files/wiwamo.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/23737676201.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/sidujonukedigarolevisofol.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56400616524.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/71755425075.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/38323106397.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c260259d46---36811870172.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210609002253_1577978311.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/39537128317.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/53953601596.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d593072a74b0a18e218cdb1250737209/63396701346.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/490a46f281a04020bf0425ff1b5d1464/rexowilizekovonexatewov.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/45050c99ec90441de0adc68e070bdf7f/94198456622.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb950b0d0---50374812844.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/84659021692.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/xafojirujugalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=metals+and+nonmetals+periodic+table+worksheetPDF 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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 11092 bytes
SHA-256: eb59be43e35c6d37cd4dc95eee762eb701b288cabf1cd8c29e194cc72e899df7
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 19648 bytes
SHA-256: 70fa24fcfa9634d0a6a290c2cafb8de2800ff93b413a1d80c1e0b1a9c58aaab0