Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cc66a49f902b06…

MALICIOUS

PDF

72.0 KB Created: 2021-11-12 12:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e79aa506358ea05d33f9dcbd6342148 SHA-1: 9e7aa7890e5f4a1fd38a51d94a0b56a50f8ce770 SHA-256: 98cc66a49f902b06e2bc39d294d9ef774ec00700486572544888a667b4176046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nikosdimos.gr/userfiles/file/xovevibubobok.pdf In PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/16463959614.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/37693540504.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/66687726414.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/59471216271.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163934846f01---35143593974.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/lijazijusitemuwiw.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/nakiwojugizuxi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/67c642dc51d00f24d9f37ae28e83e5bf/17396474693.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/porikised.pdfIn PDF document text
    • https://o-dance.com/upload/files/71578665810.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/44863201596.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/55486233190.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/76033236794.pdfIn PDF document text
    • http://floramarble.com/uploads/duvadizewawuxe.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/52697959035.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16153ec5ab079a---94673496155.pdfIn PDF document text
    • https://medius.sk/userfiles/file/26920166979.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/nekelelarimibapeli.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9a4e799c6d24db655a25ba3c2d4d80c7/merisaligile.pdfIn PDF document text
    • https://medtek.vn/storage/file/30201478389.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/71825285158.pdfIn PDF document text
    • http://compsult.net/userfiles/file/futawubi.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20211022_EDF76A9C2D05BE2F.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=4.7+cm+to+mmPDF 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_off0000b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 9684 bytes
SHA-256: 53c03d20eebb25c1f8df5284afc24f049ca6cb8b86d67f00605423371d0cf84a
font_02_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 17996 bytes
SHA-256: ebedda2eb0b9c14fc47a013e86640688abf52ff6b92315d1d0a273754bf7ff94