Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdf8a1cbab8ede7…

MALICIOUS

PDF

75.6 KB Created: 2021-10-08 02:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0217c490a4bc5d61c3583bae8be5cd61 SHA-1: f071561ac0b0685291f9ed5c5c8074c3afd540cb SHA-256: 4cdf8a1cbab8ede7795de320736d534a0ae6758cae30a5800d05236635bc53b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=graco+duo+glider+instruction+manual PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021091812465073499.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615f64bc7931d---rawamowafaki.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20211006063434.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/vigaduti.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/zumegutituponugojaxoni.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/22000440423.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ugtkfq4k329fitkr9p2v33mf87/15485039626.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/84118967166.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/50435403815.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/fatogofowopu.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/jazapaz.pdfIn PDF document text
    • https://equimat-cheval.fr/file/rusexepamimozademapoze.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-13/210913235043987787vzgpofhdledu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4gvhbkuvma9uio5s3cqsvahmdu/54969731953.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/51343743914.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6693a86c9e7eaa9515c4314dc99c918/23513931814.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7ccd23b8d5e5c1c75ae18ed07cacc428/soronatubazitabal.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7bbef900d0f6089c819616d14c5acc88/buzenopekumolejuzu.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/44875289931.pdfIn PDF document text
    • http://ukrfirework.com/images/file/74595552513.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/rawojarotikagezuvo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/83828785110.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/98769141786.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460e8439f3d---sugutuxevidawo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5d362b7f---14211806991.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_off0000c499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 17188 bytes
SHA-256: 8ab2eb054e72234e4b9047a84c65e4030ac0d1d8afc0f4684c6db067bb539ac7
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10852 bytes
SHA-256: 6a891271d95c19e7c749cd3e77a201edf1596ea185941fcd2a4d295ae8b257e5
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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