Malicious PDF — malware analysis report

Static analysis result for SHA-256 5897354edfaa742b…

MALICIOUS

PDF

72.2 KB Created: 2021-06-30 05:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7ef4a750e09576756c8bb2c716ed072 SHA-1: 3dc3c8bcf619282691094d00cffef9a762ae47e2 SHA-256: 5897354edfaa742ba56df70f4c27c719f3635376bbc7a39df0071634d0ea146d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. The document's structure suggests it is designed to host a link farm, likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6p723c4akf58td8gh3v4q2jd04/lizesiguvif.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3916d97f0e---13190602411.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ccc6494fa1bda71699dc824e5b195568/52620482833.pdf
    • http://gilendor.cz/userfiles/file/31207277844.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec800e001---vagup.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/f810ft84bbse6al9ota00657j7/26868573936.pdf
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/samadawokokaz.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ca5f8033a9aa52bf908694b03d4e9ed6/36883557846.pdf
    • http://donateagift.eu/userfiles/file/78985351778.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b234d9953---93458567039.pdf
    • http://computer-rudolstadt.de/upload/file/44424110916.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bqlsav3gaup8ndj18pe2l1c0b3/41526699925.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075902dee6bd---78717407777.pdf
    • http://albino-pitti.com/pub_img/file/59932051495.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e0ebf6bf---tajekalasipux.pdf
    • http://phuocthuan.vn/images/pic/file/63381321011.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bc12c2ef90489d1b10009df50fe5e589/83509344194.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e1dd5350755851039e8f37ad85441f32/16223861679.pdf
    • http://brandnewgoods.net/userfiles/file/mulupepavuj.pdf
    • https://trimix.bg/UserFiles/File/45910345301.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/u9fbthecqqmkp9kc75gj130meu/zovesomovukozisomivesom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+credit+card+works+pdf
    • 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_off0000bb27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 16792 bytes
font_01_sfnt_off0000d339.bin
83e31ba00a7699225312a7308e003e7e25029db5ba7081704fc3b5f503bb945b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 15636 bytes
font_02_sfnt_off0000fb6b.bin
970250691ee1f0d473ce12410c7d1164db458abb2e89a3843299a165ee71ca27
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10632 bytes