Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1df769bf6e8255f…

MALICIOUS

PDF

87.5 KB Created: 2021-07-24 09:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ef56e55aff9e2ef2edf9034fa30fa7 SHA-1: 43375fed01cbff730fb6bf126c96b02c904e87ec SHA-256: c1df769bf6e8255f119fc58b27e58a3e7d1a9d58ef489c74e1340cd1073e58fa
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS uploads supports an attack pattern involving redirection to malicious payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d39c7c889---bomenuvumibamamuze.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ca7d34ae---nupan.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160846bede57c6---55518171337.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db7db1a29---63913562735.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098465530bac---72783021787.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/96713854886.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/zikewopusizunexatini.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f903684417a03ec5a07bca7e9088ad47/sesokixotibad.pdfIn PDF document text
    • http://jarosi.hu/files/file/wasesasivaduveno.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff2ae87c5---jegofimaxedogemitor.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/12710925625.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e331145e98---13985298528.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jae8um08ta9nmmh50glirukp3v/deluz.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vanuduvidoje.pdfIn PDF document text
    • https://tavio.ru/files/file/22175759471.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9307d8e0---7073787367.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5ca569e9---vuvugafuzewo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee52bc218---10413302552.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/88385629459.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/xewetakabusudepalu.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/19807963354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=licencia+eset+endpoint+antivirus+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 18488 bytes
SHA-256: 1f8e10288164b6ee19cdd25690cc9292ec1e27a195130d90274c1038d05158d2
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10876 bytes
SHA-256: 8c3f5793beca2fd36e7afc6877af8afceb03e8b436a82c6f475c2b036c702499
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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