Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b137bc2e00f693d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 05:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb86948daf52856d1baf10663a89a664 SHA-1: af370b0bb03406e670e60428e0727c5c40db0963 SHA-256: 7b137bc2e00f693d56b2c14fc56efc0797aee69cfc2a03d641539a402828b6c5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=swarachakra+telugu+app+download PDF link annotation
    • http://candybeauty.vn/upload/files/44810327058.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5f302ab1dfafe2eb21bb102574fc6843/27645628020.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/senagusisazusonexapel.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/gugosatexibedimijowem.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109032155056405.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/89904498907.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/7437335205.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/2158412420.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/44641584024.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/wojenilovunowupofitire.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/kogasofasawexibuluto.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135388b611d0---73216705876.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/rilaw.pdfIn PDF document text
    • http://viorina-deko.com/images/file/60893757740.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e087e98f27dd16316ef26b406ef1643a/lumawerutawidedutazezaxa.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108311956337373.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4da67893---65151971546.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/18970841202.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/44350853603.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bd2bce32---27437271059.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/dafegaxi.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lodalaxodikiselinagov.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/48939090566.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/solurizozumux.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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 14268 bytes
SHA-256: ca7a97cccbfd97170c71f820af0b916c5373b50ef64fe8b9b014e9944f57a415
font_01_sfnt_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 10888 bytes
SHA-256: 187d6ca8da5c97884132e85b55591a61dd2e31e99177bbcf1b4f54aba16c52c6

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