Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e628595163ef14…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 878bb141fcb0ecb907c311f797c698dd SHA-1: a403426a933abe79c15995ea9500c67aea4bdd49 SHA-256: c3e628595163ef14795020482498544720b21bcc8dc01261a9258f3ead5f8a84
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sfeerweter.nl/userfiles/files/wovoli.pdf In PDF document text
    • http://jikaramen.com/uploads/files/75982364353.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/84043542289.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/95206101578.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p3luj033q6933ke9qvu4ed1mjq/welatup.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0209fdcf---kulajuxedefibirino.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/62307705204.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/badizilujokebivubewuguxa.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tapebit.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/45112439105.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109080244235362.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/92d1ed921942cb5c4dc1882e822e6654/lajibelax.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3b2ca7a8---merivilowifegimixakamomes.pdfIn PDF document text
    • https://12shio4.com/contents/files/wawiter.pdfIn PDF document text
    • http://fourfoods.com/images/files/datakoxuz.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/61114356274.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fomowogawomujofitukexix.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/wudinoloripuzele.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fasovojukot.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/80679108347.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/xosizijimareb.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/numixarefakasaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=retromatic+app+androidPDF 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_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10508 bytes
SHA-256: f507d775fb44e519f974fbf71a031fe1b9fcda19e235e1c2e763fe421ba3a2b8
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 17180 bytes
SHA-256: 7a13dd829738d2add27018f99a39383495f0d1fadcd3b9b9ebaadeb2a425b89e