Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f73ca40c8804ddc…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 11:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 547e9821ce3b066b9a6bf3a0faca4093 SHA-1: f64a52c347f5ccda6ec3141a7221b63326b6db5b SHA-256: 4f73ca40c8804ddcf5725f74d0c83ae2bfa865e59d588c4cc65371b453ced645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to suspicious domains, supports the conclusion that this document is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://bezagsecurity.cz/userfiles/gatuxakafudoguguj.pdf In PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mavupukebigi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700b473020---61484993480.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161406a513a62d---80649352235.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/41138141380.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/fuxugegep.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/zalizinunosugurudimut.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/badifofabu.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/rurobojibekitetatideja.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xuvefedoxe.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210915_740F9A6AE9DF871D.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/90086011168.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/31133168467.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/14515943662.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nhbt9v4jdvu3r0ja8vq2km8dbe/dixetijivasomororebafo.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/48386983646.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/ledejijiwuponawewewon.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/xatowifituke.pdfIn PDF document text
    • https://majubesar.com/contents/files/lijusupazowigijedadawaw.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/bumefilab.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/k56arsuv91km2l9hmc6htgmudh/tavuselazubinapobab.pdfIn PDF document text
    • https://windsbs.biz/files/file/jepeme.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d2b5ea2a128eaf315a038f9f267be3d2/kenufitomenekodefi.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zoxifunikov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=top+10+largest+countries+area+wisePDF 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_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 17520 bytes
SHA-256: 1984d4d0804ec94303c701d880973874a70239cfe7044c79c4d569d65159127f
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10872 bytes
SHA-256: 17246bad535ca62ab2402a5651d5e9a7be13eecfddd48843ab969319c2d273de
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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