Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0a62aff3991c23…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 06:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bae993c884adc745661cc95f5cbab440 SHA-1: 731baea49963d2535639cb591ce68479fc292236 SHA-256: 4c0a62aff3991c234f7589e36c8b78a809f8a893577fe8467c0f84b28540da6c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=stock+rom+nexus+6p PDF link annotation
    • https://theshamrockpublecco.it/file/pofeguvixenawire.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/mozavupel.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/99148248321.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109022016356686.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/ziperaxutavaborobirunejir.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/64328669829.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/vovutixumolurulidune.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5215be4f4---10889247550.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/nelixojidugekodesepudi.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/niged.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/41667914011.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/65777094316.pdfIn PDF document text
    • http://martonelektro.hu/files/file/dodedupurefamemix.pdfIn PDF document text
    • http://chongros.com/userData/board/file/jomoxokasoruxid.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/36371560137.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/pudizefetukutotu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/zibulinivupatizagesoxap.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/19699428119.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9e07c019---bololatedavilixo.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/nusuvitidubafewasulirol.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed864c521---wibemepasavelugusokuved.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/rawixakevogasawivaz.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/somojejajilaraj.pdfIn PDF document text
    • http://vaithun.net/upload/files/kelemekosudovebafemu.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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 18148 bytes
SHA-256: 4c3ed09e01c394fd81f413f794da26ce3576b3374164e4cd9718847a277dad04
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 10772 bytes
SHA-256: 54cca82da190cb0adfd262cb8067ab8da37a083b7b32bf80e8c32c1fd65e37d7
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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