Malicious PDF — malware analysis report

Static analysis result for SHA-256 a849368d64776434…

MALICIOUS

PDF

78.7 KB Created: 2021-06-11 21:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d676b8406d20d50da3a0e3138025f36 SHA-1: 15e0cd02efc4353af69c34f0fdcd0041d6b7e2c9 SHA-256: a849368d64776434e1998defb229503b48820f3c38b7d445dd86c76a41f1caaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate that some of these links point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=vaseegara+song+instrumental+mp3+free+download
    • http://aggengr.com/uploads/CMS/file/migoxuzop.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436f8923a9---14436167404.pdf
    • http://uptownherndon.com/uploads/files/fegom.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842aa75e6c4---tiberuniposebo.pdf
    • http://eotp.info/sites/default/files/fck/file/22219522329.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/32736768043.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160804d199a450---22120294775.pdf
    • http://ladyvenus.it/userfiles/files/90092305713.pdf
    • http://hawks79.com/clients/85064/File/boloberowago.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/076d3ivd6gi92cins515o1c84d/97183128075.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5684eb90d7c6d22262e1555fe101730/84554939286.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/olh8u5427hc5fhfcf5366fkqiv/59369320631.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2278099c54---tivujeguv.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160815fca987b7---kedeta.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c152f4e890a---25524229955.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/4eitj4clgeinu50h8528ojmtc9/ridolaxikito.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a47c754cb546d833fa2df67d982cc3cb/49703311734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin
8469b283fd71712176b31a28b2f35e8fcc30bbf1ac9f05b0e5c65c6fe8221821		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5464 bytes
font_01_sfnt_off0000fb13.bin
b26d9ffc3d2c6001c9e482083111e72c84d7e85e9a164b653d4d131301ee8544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10660 bytes
font_02_sfnt_off00011f82.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 4324 bytes

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