Malicious PDF — malware analysis report

Static analysis result for SHA-256 751286dc9be6473a…

MALICIOUS

PDF

79.5 KB Created: 2021-07-16 01:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45cb6d5b20dff58d191cf13d8eb4c120 SHA-1: 9be92198e7d5f0512e9726d046a395b64c58efef SHA-256: 751286dc9be6473a32d0c71ab72f90791e99f05ab67f9ae818c46e8bf2b4e416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infoenergie-loire.org/userfiles/file/nabobij.pdf In PDF document text
    • https://computerzone.pk/file/95834616327.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/68637631058.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/98797252251.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/banuwisifuruxoteziwekovu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d12a3jv98n0kk0h8iqps9bia15/28621752777.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab747e4780---38035150353.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nidapitewozemirijitakasi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f74419a0b---rupox.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/49050378695.pdfIn PDF document text
    • https://esz.jp/img/editor/files/lidilugalomege.pdfIn PDF document text
    • http://jaika.in/images/documents/files/788878305.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/90512802337.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cabb9f8acb1---davuji.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vorowakapi.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/64969377590.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/suvafukisinuwib.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/32128116581.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mduuhcqfdsci1ljkksp16fpflt/16485239124.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f3f26782---dafurefujowatolijenuson.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/544256008.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/283ef09b2df634e2738f34099716a6bb/62413333630.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/dd7f6b3744009b26a8c0071b6f4cafcf/bereligopofen.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/oih8a0vg1daq21omqmgimg5g32/71054504746.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/wowopezusu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97d1065eb---dunupomorurosigelulumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bring+to+the+fore+synonymPDF 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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 10620 bytes
SHA-256: 92237752d70f8286f7537f85c45545458a592ba5feb2fed0c191361884955300
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 17812 bytes
SHA-256: b9112b9696634bb43590fcda0af6fb551e6a755bf39345a3e1f1742a1e95a353
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1