Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfcd72a6725d30c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 11:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f4bc79130cce23322113dc6be33ae09 SHA-1: d8aea97976bc16003e2ceb01761ffcf5f50f7f15 SHA-256: fdfcd72a6725d30c6da8f9fedccb5ef30b4059b54a7305b5480814b1924dc1c8
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dh-cell.net/ckfinder/userfiles/files/sizosiwezap.pdf In PDF document text
    • http://videlec.be/ressource/file/51030259209.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9dc6bef9d---85763096763.pdfIn PDF document text
    • http://corkpotters.com/images/38678154776.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/50293887151.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/18646766758.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/93321522474.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23609359635.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d9a41046---votoxere.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nbj0jcg7ljv30383ed5ng136e0/69580614003.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316b9c1de54---75169263395.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906233056238.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/76546717518.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/radog.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/bewulilujugeja.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/88506429066.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/333593408.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210902030909.pdfIn PDF document text
    • http://speckrepej.com/upload/file/26536819132.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/dipimikatugofebifed.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139679a5815b---24578412511.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/88529769845.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/28130216774.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109032237291744.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/7951698482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=good+words+with+the+letter+rPDF 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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 10204 bytes
SHA-256: b92d1f1173a25eaa63f683d16e1cf4f8d97e6ea229321206b9923be545404de6
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 17440 bytes
SHA-256: eddd177e184d3e538dc4c7f54330e0bf985a645509e5579eb71d56ca7860a769
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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