Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5621dcad33052a…

MALICIOUS

PDF

81.0 KB Created: 2021-07-08 04:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ada5288dfbd4055c5bd3f613071b65a0 SHA-1: e8eed42a21eabbf489b8ad54930ed03cc020b873 SHA-256: 1e5621dcad33052a032122de3c494a8e18463cc4859b1716d98dd1ff81d7a182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

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 http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe49c9327f---kijir.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3defb815d---79166021185.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2421695a---xufudozexexomisubuje.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4604664cd---zosipadavoxijuke.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/99021695141.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/guxefivajoxapi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/nigoli.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/pefuxajazirujidemiraro.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/616f708238b7215f392a0b3dfc4192a4/fuwizopigurovasenatunir.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2d8ae16ac---fesif.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0216eb9f5---13931373233.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/904080032b8fc106208e5b3c3a300539/98491507409.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jojovimavigode.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d30fd43ae6b---62320257813.pdfIn PDF document text
    • http://beta-rc.com/upload/files/pitivujoregixesudipalip.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a686144---25522987935.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bfec677eb4781948df2c75c006441906/43571221317.pdfIn PDF document text
    • https://led7.ru/file/lurowi.pdfIn PDF document text
    • http://rsst77.ru/upload/files/58058141155.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/bokefele.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97bbcec5a---rebexaruxureje.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/95518044759.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/42742692617.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/190cd568f9780cc479ebf79ccfb0a13b/48188838461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=project+tv+unblockedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 10472 bytes
SHA-256: 76066b3dcf1de9b035e81ff8e6e8e71dad674d4e3a5221f07338dd81c98ad6bd
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16292 bytes
SHA-256: d3d391e016f9beb6d60588f62b25489b6f568dea96880aba67761abb1d24282a
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1