Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d5ac797c98f927…

MALICIOUS

PDF

78.1 KB Created: 2021-06-28 03:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: cdc0d6fa9c2f2d1fb01516b3113b94a2 SHA-1: 62f6911dd07eb7982f73fa46be43abbc8d56ed35 SHA-256: b7d5ac797c98f927c87979b981a9d584d16bc9c1cd5d07217b18d40e0eb66cfd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

Heuristics 5

  • 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
  • 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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5b3bce800a02fb4578848d4bcc7d6a99/3691571875.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fe080e66093d08f9c0ac0559810c87e3/89954445676.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1004d077---45097932563.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986f335b284---rikolemuvuxewup.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/dawoguninedaku.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074994591c99---jinabotiredugelaxinade.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0547121dd1---noganojagaz.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/171cc6a1be69e7dc2e2fabb15f302b91/92981643122.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050302321773499.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088077b05b8d---siwujodowakelaxuvewulal.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b072c369e---bibebujuninapefimojujonam.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/29580492b775797cf500777cf1ff70f2/vafufuzunilesodowudexokin.pdfIn PDF document text
    • https://medtek.vn/storage/file/gagafomalafupasis.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb6b2a2d2a---rinibuzerutuzufoz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5f9b45350db048a8da5f6314c22911f6/74615707124.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/fezozu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c0cc33b151ba44b1b6acdfb249c3073d/divibusot.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/gasobawekojuxam.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/71999870077.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39e2390889---7851852910.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/bijomapabixiwiwazufub.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7422cfbf4e8120302c11fbaadc9610e2/87165036442.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb5930ff50---riregi.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/lusejidisadaxunoti.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8d965035---kadixonudiwovanafipuxoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mp40+pack+a+punchPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10100 bytes
SHA-256: cb6f83c62b120f6a1c04da3de932326721c4542ad636e9e12b634eb9304ca677
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1