Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f33fbde4f2b9ab…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 18:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4858c7d7339cf05d9bdb4fe63ab3a5e6 SHA-1: 208cca17a779186dfc29a45a99b423ce2342dd9c SHA-256: 09f33fbde4f2b9ab293e24ba77483e5c6baf364501e38d82ee26315601f8caba
176 Risk Score

Malware Insights

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

This PDF is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to disposable hosting and compromised CMS upload storage, suggesting it's part of a campaign to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to exploit vulnerabilities or trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/nikaj.pdf In PDF document text
    • https://diedacorporation.net/freesiafiles/file/wodagusikanarixul.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082214296b6d---ralapovowuxuw.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/91473524093.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c578e9f6f2---danerexa.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/rivilusopobirekulirusuva.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfea5ef7a---nekexemamexuzavugud.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/19357605891.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/f7bc29530b564bb181f10e8b3b83ce75/kenov.pdfIn PDF document text
    • http://ipublicity.cz/data/file/jetolivejowadubupurap.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/50805048359.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/30768343186.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/24275238673.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/8262908835.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/53905198762.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210813205427.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/kemenis.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/31897006915.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/p85ir9tllf7atgtogrqe7p6tt7/84513668939.pdfIn PDF document text
    • https://0900107678.com/upload/file/57940580305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dropbox+ipad+annotate+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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 17424 bytes
SHA-256: e9e87c3dc8b9ea12ef3d273229892919c3bd5acc3110aeed233159b136daa34c
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 10520 bytes
SHA-256: f135a95f658bb1afb84084f6770e07ef640f905036d9f96e5f21f0f25845ce5d

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