Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c1ee28087183dd…

MALICIOUS

PDF

102.1 KB Created: 2021-06-25 23:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 00aaf1affe6c69796b416767ce02a2ed SHA-1: 0a0d492797847bc8baa3334d241e6e5d86ef8c41 SHA-256: 29c1ee28087183dddc85d2016d7c4f98db7ccabe1e286dadad704b7facfb7a0e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be to redirect users to potentially harmful content or facilitate further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://hizlipin.com/calisma2/files/uploads/mizaji.pdf In PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/24804400564.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8072e406a2b98c635e0427e248c086e1/rexowoloju.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d07aaffdb---kusatuf.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a3126073f97240b2d0a93c67e95f3524/15862293860.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/56238822426.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4efcbb5fb8---novuvijogibazatoxuf.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/57165803197.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/43677973318.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b92a8b69047---54128038472.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f037583c---49393448679.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/47041453173.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/suzepepuponirekiladanotem.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e83f6a0cf7a536a05302ba7958f173d/45865928018.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/46015676500.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/15170c56a2da895f25db72fd1a8853cc/vivuso.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5677893493---35342370461.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/50628303236.pdfIn PDF document text
    • http://short-story.ru/upload/file/dumikewawoted.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb365bec6c---27398174459.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba7fd83f5---tasisuragelelofijasanejog.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ed2ad176fb027fd981409e6133976d93/62873447256.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f2f594b0e323e444aee343336610ac/dikedavevag.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/31d61a0dd226c945417a7c9b0e3dca15/senilesufaxujudezi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f343f2941f---pefuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kind+words+starting+with+cPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 10548 bytes
SHA-256: b421334a7124f30de90f81b82c284d5dc47513dbfb19f68125e206a97ad5d086
font_02_sfnt_off00014701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14701 16804 bytes
SHA-256: d5088896d1093b07b646a1f3735e0aeff5f866fa999cd876e0fa7ca363b77f1a
font_03_sfnt_off0001724e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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