Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a52f087a9f36c0a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-06 20:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 127b74dfecaf489f7bf06b38898a35ff SHA-1: 6df77766c25c51dd65790782f16bbfb85b175fda SHA-256: 9a52f087a9f36c0abc945fbdf0b492fc8a7158199b9b506b9d0c53e70ee0c812
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host and distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=james+and+the+giant+peach+read+online
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c200f96f779450c891a919ca2a9f833/ribumekerobizovakaxava.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/091dda54894d44b18798373d4d244148/fepusawejoxuv.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608761758fbba---97613695641.pdf
    • http://dichvutot99.com/webroot/img/files/98057211966.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/p7q4bvmtbr73b7b31vkt7kqed7/logojadopilovoked.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b709be5a59730ffb81e31ad46504f7fa/78048533397.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c819d2b43---tirelin.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad155bd981edb96fe62110d482451873/24611612699.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8f18ad42c167b518aed14d69a5d28732/60713334973.pdf
    • https://abugfreemind.com/userfiles/file/biforebixedup.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c431d501b1dd5ba5ea251957c77e30b6/99884778818.pdf
    • http://soft-pro.hr/upload/datoteke/mexativomerupisam.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1433c95ed7e4f4bd54267a4c98ec1c38/soket.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7m3asqnqd84qqqtouv7gc5f7vt/finomitesekekonusetut.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7580f84345---69849502127.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f11526bc86---zidunofotamunu.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0661da17b8---xubuloda.pdf
    • https://mamo-tato.ro/userfiles/file/gikosobotar.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090031dd8395---welepesadidedub.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c1726628676050781e954bf213d90e99/resinu.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/winolikegulibojunobef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f482.bin
bf6057b57dcd6621a37dee8628b91204b6dfe0f864ec2eecccc8ce50d328249a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 10952 bytes
font_01_sfnt_off00010d6c.bin
212fa00c159ebce321c65470e7d08037b8f08f60cd05d8c335d0d84f151199ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 17568 bytes
font_02_sfnt_off00013acb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 16792 bytes