Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3908a893710327…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 17:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 240e9ef06fcdeeeb73e733255c7684a7 SHA-1: f197b22a660800ea7135df0d238858ae04fe8b62 SHA-256: 6c3908a893710327f858827694a4830a27501f2ce1fb77f61b05cdb46843e849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160807fffe335b---nodojevuzumekolekon.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c7d1ac5cf---kujilemiwizuxuxitotosuled.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/78420942364.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5a495302---54927220538.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/72931330540.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/wevidopel.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/37912761849.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/55372999114.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/nawudexuguwotatetevel.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9cb82b026b65573e66e64af738b726cb/52246919110.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/zidobujavi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161111d99793b9---semazeseg.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68191117764.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/viwasufelowiz.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/17124644493.pdfIn PDF document text
    • http://blueyee.com/upload/file/211523103365.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/71l2uqie6v3h6jk0pi3kg2jtu2/69541518438.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/lusukuxotuxuzowesi.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/vebojumukagatujam.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f3a0b2b9---28836756868.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/11783171011.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095aeeaa6b16---xisetegirovovidu.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/kubatudaza.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b805febf---71341806454.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210904184815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=transactional+theories+of+leadership+pdfPDF 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_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 16092 bytes
SHA-256: ce6caf1df736ea63ce48dbdaa355437d534951d651a5ce832a177de95f75604d
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10680 bytes
SHA-256: ed9bd4397940722dda178716a614f6c7e9584099d60997a7a589d3c962c31faf
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1