Malicious PDF — malware analysis report

Static analysis result for SHA-256 c900121c37d9cce1…

MALICIOUS

PDF

87.0 KB Created: 2021-07-27 10:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b354be6f0549f351bfe2e65c25c46e7 SHA-1: c9370a0a22e8b7e29b1c5f05ae70db6a31652f99 SHA-256: c900121c37d9cce147c52f2e24f70dd20455d9f68485c44b794ecf58a7fb94d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised websites, likely to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 7

  • 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.
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vf1q4m5e3suabv0fnksqagj706/15136096212.pdf In PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pg30quanklkrq38l1t864v3gjo/85684421628.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40eec9e76---47020825073.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502181558_1787223155.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaefb091d2---4874591222.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e48f7664c1270dca8d2beef639e650f0/54778964086.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081276bac357---walimoj.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f4ec68c9---72004760882.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cu83tg1f0t7i7ev5m4c6df3fjb/76075415797.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e930602d7---rapepifowaguxazoxeba.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/15238123550.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zamiramug.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/xamodebukedekozedab.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc438b5c1a---sadun.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/pikifusunijagabutemunewop.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/26571144821.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/16763009.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/n53fcs9k1lvnmm2mj3vg8b6qvl/54396336675.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8b405bd8bc05ec1bec1093b14389d6a2/45287485408.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/kimonanixiletiweru.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/wiradopidelibimekerado.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/77395544123.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ro3e7mulq7ma9k20ore1t8p00m/rufuge.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/n99qcag25kisdkv1tqh26tbceu/maxitawudaviduxoso.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079df096d6f0---92055669828.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0ad51a9ece1b63364ce2a3d7e7e5d27e/90308369571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+science+of+psychology+an+appreciative+view+4th+edition+access+codePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 17744 bytes
SHA-256: ca7d1241b2fd7fbcaeb53ac8b3010ef6412600d962bd2f90b4f270dd09ab01a8
font_03_sfnt_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 11208 bytes
SHA-256: d2d676ac7ce115485c8c0797756a84379313e4b5f319f088e0192426024b274f

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