Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb229f9791449fb2…

MALICIOUS

PDF

80.3 KB Created: 2021-08-23 14:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b157792bd0e5f65d0a565ca3cec68d5 SHA-1: 8c7441b47ed18bd63adde1b9c11db1187f932c4a SHA-256: fb229f9791449fb2fee9fb93852b7d6c7adb2d9f7e2889dd63fccd5d4e677267
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple distinct hosts and links indicates a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5dd8306f3d587f8b0f28e7c17f73ca0c/90438522944.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf6b8150e---jefoxesagovamelevevos.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/500ab9c679ecf7a11f3f20fb4c701c65/59855083321.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/753925307.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/dufotetofotaletijaxew.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/butilegijojijejolijedev.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe3722790---15756182402.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/tujixuz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086faa871123---puzomaxotowu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/92fe81d7c7fba02187c8232c6d6fbc1e/zuligexojetigoxigu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9eaff4a490f7a5d2d954f2a0475d1016/91639001384.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/dasakedujebefar.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/93472438778.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/popuwijodubabuvudewegana.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad37b0871a---gapoferufiguzo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ss757lo9h9u9ck0nh3qdgu8ddu/23683652976.pdfIn PDF document text
    • https://bczenekar.hu/files/file/25620457246.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/d3ls49nci9jjgoisad783ev198/23137322162.pdfIn PDF document text
    • https://landi-bg.com/images/file/goxeroxaginetamusilile.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/94627489076.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/40cf93c9d43a33ed515a74b42dba9ab0/848273725.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609025c33cac0---13788315250.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/8931564394.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0fa67989---fuzulasu.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/92816585721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exercise+3+review+sheet+the+cell+anatomy+and+divisionPDF 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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16476 bytes
SHA-256: 81a5daa70db628946304a04dbea9bceb08b4b2e874ff0d425f7fcb693b3291a1
font_02_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 11156 bytes
SHA-256: befee703903a39d9c2e452ea2e640b7a119898dcdc4dd8f7618a2e94658967ba