Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b76e989e65913d…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 11:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d04152ef9788fe1899e81f6448f6367b SHA-1: 8399ae2476a9a540696a7498beab5608f0bceae8 SHA-256: f1b76e989e65913d2cade55f32febf9a62a7a1f01b0ea8f68080b307d625edf1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://cructi.ru/uplcv?utm_term=pokemon+go+gps+not+working PDF link annotation
    • http://telektrans.hu/editor_up/39728561930.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/25263063018.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/rozapidafenifuvef.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1bd1fae1---55697343199.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/25135132709.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/xevebafisomedunadalemogi.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/19312215690.pdfIn PDF document text
    • http://katela.net/userData/board/file/gexejilawafalagadadube.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/67136014709.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/84489185145.pdfIn PDF document text
    • https://moolans.com/uploads/files/51479049491.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/lixiwuvuzajo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613fec011a14d---22926182193.pdfIn PDF document text
    • https://durimawar.com/contents/files/6978605220.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/nofikozufajerabexosu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c0001fcf---23696795538.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/98623375818.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/50750448861.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/13780261545.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161431ba30edf0---86621527854.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/zidimolumigibuguxerujoziw.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/31539788874.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/46158667595.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/78855544592.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/92607245161.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/56404235177.pdfIn PDF document text
    • http://airfa.it/userfiles/file/ribipararomomojafi.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/xavatedujowimiges.pdfIn PDF document text
    • 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_off0000b59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59B 16732 bytes
SHA-256: 58448a8dd4a1c69376a4f0b2bb225b665c40e5856570367283cfd9a10ed62538
font_01_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10564 bytes
SHA-256: d7ad115d2934d2730ed353e1ac48e517847490669c378209c8bc4c6e4052f6d7

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