Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9d2cc6a513deeb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 08:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2984c8dd84cb820af1b2ebbf19e5538a SHA-1: 583c19562543e02af6c46868c33c148bec84a6b8 SHA-256: de9d2cc6a513deebb684d39465d84d294dc8c87b57c6dcc4902c1cafd65b07f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm that points to multiple URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ra7a7p-h3ba7.com/contents/files/29149371882.pdf In PDF document text
    • http://i-tos.com/userData/board/file/xomedewe.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/jovovawobezomusuvidosaxa.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/pezelolunibupamozalamas.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xexipavoripoxelunasixuwas.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a28bc9637---6552098584.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/42954415565.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/29ffcaef84da0711d23dd066449c1ef1/95377882451.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/79338127269.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/49036920755.pdfIn PDF document text
    • https://protrialse.eu/files/files/97232634902.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/29039406953.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/52808663282.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8d8b320b---3328200876.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/gekuvilolesomikupedagax.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/abdbc3eca752177ac780950cfc2d1631/fotigudakavulijasaguti.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/32852300140.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/fupaz.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/92881601679.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/30843361422.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/54797808034.pdfIn PDF document text
    • https://wecareprogram.org/images/file/86655661713.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613546f2b6bdc---20425669881.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/98763314654.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/gaxuluri.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/nofuwulupojavinok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=programming+android+apps+in+javaPDF 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_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 10656 bytes
SHA-256: 7b430dd3d6fab910f4c80fd8aea2e0b913f97a2d2b09d61d9f68bd7580d47556
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 18088 bytes
SHA-256: a84feb3cb2675c8f7ac35347c735b3b2cebbd54d48d29db2697035ebff5a06c1
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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