Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f16e5b122edb9a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-06 09:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2366366ce66a01d3807ff57716b1f957 SHA-1: 9f52a3dc178ed35d421e8ec58102a3e935accdb7 SHA-256: 18f16e5b122edb9a86cdbe9f566ba6a265d9c4c763d26fd7aab3c38969bdf9c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=cartas+eruditas+y+curiosas+pdf PDF link annotation
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18364e8c1e---zejisaliwiwegigexi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c77a5555---73822887410.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/legufipawusukululor.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zujitezirin.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611109b2b4b99---69350486231.pdfIn PDF document text
    • http://sieuthigo.vn/upload/ck/files/zonanajopaku.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609732ff13e47---36416532260.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/dozaxagaduzegaba.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/75001935600.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/12qbpepmcsep8dhbb70j7sstm7/megixekesabokom.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17351683191.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e65fc2edfbf354d6c20a362e27b0ae63/41520978047.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a9544978037512fc39afee5ded5094/janirimebuworetif.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/32859145244.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/3104112275.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/fapezozavoras.pdfIn PDF document text
    • http://linza-market.ru/upload/files/87810552431.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jlkkd6himj540iqpo13sf39340/74039644161.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/ruwow.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_off0000ad2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 10708 bytes
SHA-256: 8ca032cdb495e2369557f538c6919e8e73781e0e979e9378043d805e5d2ddbe3
font_02_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16300 bytes
SHA-256: 7cc274e50040a81119a7fec6d7bf08bcb440c15aaec64cb19d6c16a5b605c61a