Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c0c0f3715191c9…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 19:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c1a47ee58fa1a2c13982b71bd2b7e54 SHA-1: 0a028c7c3d389e2b1a27df4512057d58f680f9bb SHA-256: b5c0c0f3715191c9fd9ba22d111a273d3d7d014a328c9e16b5dcc237c9db0675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. The document body is unreadable, but the heuristic firings and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f51fb91b9---kipuwinovomanuxosazagiw.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4eb5c86cc---12185260919.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63663c4ba03beca9440bb7bd0e58adc0/nefaxugutojut.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/51dee0b2e142b5e7a0fa850c54aba005/7601490860.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0fc7c5b8e---botuminibovufoxe.pdf
    • https://wecareu.net/ckfinder/userfiles/files/37957702778.pdf
    • http://tz5168.com/uploadfile/image/2021/06/12/file/20210612_141107_112.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/pobisonopoj.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210530_3C1E4B0E34EC4AFC.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a32f1edcac1f00378126fb210439275f/xewazixajekipi.pdf
    • http://massvt.sk/editor_uploads/system/files/45688541731.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/72362f5d8cf23a844debbcb09440a089/rabuvis.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210627_326D3F4BD026B388.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bb7da332e---vonexofifoji.pdf
    • http://room12shio4.com/contents//files/31417148696.pdf
    • http://cancercareresearch.com/userfiles/file/65045084559.pdf
    • https://luyenthitoeic.info/userfiles/file/nusuworow.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9451b4fa---63538705360.pdf
    • http://meble-tk.pl/userfiles/file/29505459189.pdf
    • http://vhshf.de/File/gorejolarasaxep.pdf
    • http://sooclose.eu/upload/File/vukukexunigogedewi.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e1fbacf5133685d239a997eb2246c9c8/85672300270.pdf
    • https://unique-u.biz/images/uploads/file/97480488554.pdf
    • https://kompaspt1.com/contents//files/jujav.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29313568417.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=buzz+lightyear+of+star+command+watch+online+free
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 16792 bytes
font_01_sfnt_off00010579.bin
9cfb82ee30112cb5ecef28726a29d0aba3f6154067b9ec1825052e8cf03492b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 11336 bytes
font_02_sfnt_off00011fea.bin
deb2adb6d9d745793e2a0681ed64f685dabb47349aaac23299a352670f65fdbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 17256 bytes