Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9110d4fee582ca8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 20:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe6ea2401170bedb5685920dc069bf37 SHA-1: 2c07a501d10f265fd5a333d8e509ff91bc044459 SHA-256: e9110d4fee582ca83fd5ed8399315d7d21eae1110753963e1774ee07a9b9a970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs point to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The file's structure and URL patterns are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=traducir+archivo+pdf+del+ingles+al+espa%C3%B1ol PDF link annotation
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f71d76f30---fobekijawaxuma.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4594d49be7---gapigowozotazojiziju.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xogoxamivaratigatupuwoxi.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/52124979448.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/74391516226.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/xinotevas.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3185385b---xuwigurekuj.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc9f080e2---67628453088.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zebinagopumopujoxane.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fab38205---61245257331.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nucat8gqj72o59q87gi11fiirc/fojubipazuviram.pdfIn PDF document text
    • https://buka.ru/sadm_files/51999811852.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/kafidegemomasivosapap.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb79a198167---66229601900.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0953e8285fcb80af6f4f5619820c1ebb/gumexamebivalamedevosefif.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d89c341490f2bf0573b9ddd395b67b7b/29511671455.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/8977098046.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/18462091920.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/29174168c8315a7f48e941ac17f9dde4/mezaxagikorexepawazadise.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609405da8ad4d---52205159441.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wetisazemozuzi.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/kimewamefunedabifos.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3jc74e577js6c2mke349f4v9p0/8905307030.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/menogitodopumobo.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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 19144 bytes
SHA-256: a576f009109914a95775104c8002f305a7f557747ff6daae728bc68e8e8ac1a5
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 11136 bytes
SHA-256: e900944104058b5a794f5236fd5febb66333cc27b3aea5e7f0224169ad274667
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1