Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27691cb58e42f75…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 07:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1577d0b3f57b1b5ce21eeef00879a30 SHA-1: 9594961c303aeee7c2e5a3a5228ebe0406ac33da SHA-256: c27691cb58e42f7545e2fdab5443a56b3f042b2b83651ea6b963d31382f1df09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and other potentially malicious PDF files. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082da967fa89---19120392547.pdf In PDF document text
    • http://wu-pao.com/upfiles/editor/files/lejaverakufir.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ea4514ee80e6beaa7a76131ca0842831/84652825098.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/qs18mkh7ead5krkfdq06nsu4mt/garukibi.pdfIn PDF document text
    • http://www.ezmoving.com/file/12385491696.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e7bfe703f44f33c154b1bb2dda0b8b41/80723455997.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb56d3d6d5---29471944667.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ffd7df3fcbd8c391fe448c7c7e215cb8/78646033812.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bb94604f909f520e9ca4eb0f3f003d5/81606368283.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1016be08cf83280baf67ed670197557c/82500686904.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/tenowusolezixamidis.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a661d53a299---30331941258.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7a1be318c---dugesarot.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375d42c7ea---64033429596.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/88869643655.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/gamesadowisolize.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/1205349344.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wepep.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/68361468739.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/bb6f62c02d39cf22ecd282eb4b7a87f6/wudorefibesavud.pdfIn PDF document text
    • https://orrizon.ru/images/file/48405791766.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/mobodedekimuzow.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ca31cc0f---27790092092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=describe+the+sequence+of+events+in+the+formation+of+an+evaporitePDF 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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 11152 bytes
SHA-256: 6d39b63bf0110088c5e7999c46ff9a704b352a5fd3b461a4d9ee28e77a188d99
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 18360 bytes
SHA-256: d25ba8b61f455be5b0014e00a2faaa7f79542998ae8095e8a4020ad8f6b464aa

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