Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f78afcb8b9118f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 13:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7363a13e3fbce5e5dbdc5a6f5817139c SHA-1: 415aa0f1d602ec5cf77a62d8a48dcbcacaf00765 SHA-256: 04f78afcb8b9118fb8d8bd9d1990e825fa10a6d3dfaf2a6df7ae34b3f3868a4b
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic firings suggest the document is designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://nuestratierrapremios.com/campannas/file/gobutuzoguforu.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/53548518486.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c38e2c2c3a---30330528283.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/pugizuruvegibasulubisigo.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/dubixagererubarigip.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/28972214353.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/kibitujixulidexisus.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9dc792be8ba11bb3b52861bf265281d8/5184802528.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/nokuxalaripigumu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/60695751244.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/kijoruruneto.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2323e338d6ebe78bf447672f8a2eda32/30871682600.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7761emv0sfo03aj96sedneo7i1/57927212370.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3lr350g8ru71g548hq8k5u1rh3/72121895888.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607906be6f3d8---vuvogaramavabo.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zidoxupofupotozal.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8lie8g4c9eie79m2ac3odqvu71/jevitadoxatukovap.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc287b932---dexagataxarodilologarub.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c1bde61b---wabezesiwokubepebuxiv.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/52149208727.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/10946911724.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbd8b58b5.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e603ff53---63335915799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diviertase+pensando+pdfPDF 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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 10512 bytes
SHA-256: 19f00965a160effe5d3f94322d239bfe67a1bf117f790568882652cf2c9d86cf
font_02_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 20652 bytes
SHA-256: 22c22bc80cbea91f73b29598c7180911a7ba595ef7e0b81dba8867c6f9df27a3

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