Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0736b8fb4c1f68…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 00:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7e7f5ec7942797d4b6b7f416a1f44b3 SHA-1: 21354392943187cb8b2c0f6b62f1d0ad9cded228 SHA-256: fb0736b8fb4c1f68b8580f4c1e97bed106488eb83004f6ea69b912f4c9d39f69
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on potentially compromised CMS uploads or disposable domains. The presence of an IP address literal in a URI further suggests suspicious activity. The primary goal appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/vawaxokojidetivut.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s09h5c3avgdqrk65ejhlgmq8qn/58260237205.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160797cda6fa34---92944223184.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160940a5c05ba5---kilirapilalakutaxa.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wugusitalinuvominoxan.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021511322413076.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/timevoveluse.pdfPDF link annotation
    • http://munnarinfo.in/userfiles/file/6076461231.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/jujomororidemuvepopo.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/dorisozawigipepazaz.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc5573a8d---76985410348.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab74e7b3bf1---texadukumod.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082584e63b2c---devuvasurojel.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/977f9003a1a55c7fa3690dc7a1dea322/sarapapaxutexifap.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/53523335618.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/52816246436.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0703754e9e5cae48b1375da1cb281e63/7189630604.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/98972158178.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/90570468031.pdfIn PDF document text
    • http://www.520amis.com/upload/files/58264972601.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/25781479776.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/eb032b888dc79562472a6755108bb6b3/1929882661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=change+to+widescreen+powerpointPDF 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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10864 bytes
SHA-256: 0d4a78f35bb0acb23506986a6e133dfe9a5085fec8073647671ea9a1f4b07768
font_02_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 17140 bytes
SHA-256: 3ed93e916c485291957e504afdc84696b3fcddeb92d37046746a4d54638e637f

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