Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d58ccf0214aff6…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 17:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81acf865338caa801542b4a7caa11281 SHA-1: bafd9df3dce1ae56d7306a871047c96820c68b48 SHA-256: 57d58ccf0214aff6ff35f05e740ddc8d062886c07a3fb917f96f70c606d200e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=neet+2011+question+paper+with+solutions+pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c28141dbbf---roxaxen.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/pinemipegezewaw.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8a3cc27c6acf613f613a6888ad282923/33843205082.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969928e8dba---81008842060.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c2166643---33886991515.pdf
    • https://inncredel.com/uploads/85886096446.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e679ad1d991169cfa5acd333711f727d/silinevodol.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f26434e1b6---44384561570.pdf
    • http://bularz-auto.pl/images/userfiles/file/31839948230.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fpdhm1sidbip1kk3ul9l9bevql/12972480772.pdf
    • https://texigo.tw/upfile/files/2021/06/25/52512483595.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6vc7vpve0ics1td78d39amaq0r/39915758946.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f25e755175a7f877e273d436293bb08b/4991870836.pdf
    • https://energooptima.hu/upload/File/vakowedarikabujira.pdf
    • https://vandolderskb.com/images/usr/60365968255.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e74c50c28---1983782292.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9cf8de0f339767b0d7b4446336a76604/misipufozusivakixige.pdf
    • http://tunglamgarden.com/images/fck/file/20957601731.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/fobasejewavowinetitizabog.pdf
    • http://accu-chek-event.com/ckupload/files/27441607129.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eff6e8cf4---jidedi.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/cc8012e219e65363a3860e8d5be121c7/95451969091.pdf
    • http://terminsk.by/pics/files/25413047878.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_off0000e381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16792 bytes
font_01_sfnt_off0000fb98.bin
fb0e030eb118f9c4622aed4b15b65b0be439126c68c6d8f2388ddff2265c2945
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 11200 bytes
font_02_sfnt_off000115ab.bin
cbeb2f464f801763eb0e74cff5797b3dce700ce5e0c26107c7723c088682131b
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16744 bytes