Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9e7f48d4cf6b9d…

MALICIOUS

PDF

75.9 KB Created: 2021-07-02 08:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d361f4825f01aff2d23762f6860a392 SHA-1: d93426bde0f73887d53546df94ea0f27f6b98b6b SHA-256: dd9e7f48d4cf6b9dd214243b10451dc778c2d9cc3eb3d51aff44ceec6f9b6e3e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://hanahana.vn/media/ftp/file/tavufumus.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bde18106b---30119355248.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6e209295---kabujowosebipu.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/molaruzerusegel.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/94555729666.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1c3df337bb1c43f5138fca00ccad6dab/74312399807.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4491a6c8acabb33e91db8fe47e0184fc/69874809751.pdf
    • http://morgancountyoh.com/userimages/todisuvemafefuxixilunevux.pdf
    • https://repare-ton-smartphone.com/userfiles/file/64967916449.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/74d44141fc9a184880b8cbb3cd64528b/xupafejixowu.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/46125c388363e7689a50ddfedd06ec9a/fipege.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/322a80piigh62c1rucqft4u3pr/fotoritikib.pdf
    • http://thingsantiquesla.com/userfiles/files/xitibobugumajejukikij.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092610ea4c67---86011663020.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1b79f30c---76246230720.pdf
    • http://soflocops.com/clients/67403/File/tibonujenu.pdf
    • https://nic-irq.com/userfiles/files/zupil.pdf
    • http://china-hold.com/UploadFile/file/20210606014825467.pdf
    • http://szguilong.com/userfiles/files/mizofagatesuz.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd01ac44a---76977021903.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc452f65731---6133635761.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qpol4tihnmkgbu39797cgn81f7/zilum.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/4itf92tctfenu1l5hhdja0q704/tikobazizigokaw.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/92210997477.pdf
    • http://elm3rad.com/file/44375915578.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3e016537---13164248221.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=find+a+cubic+polynomial+with+the+sum+of+the+product+of+its+zeroes+taken+two+at+a+time
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb9.bin
569901d5ede90eca2f7b807ee68ec429dc0d1bd1497907eb12f77f8a836ff589
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 11456 bytes
font_01_sfnt_off0000d974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 16792 bytes
font_02_sfnt_off0000f186.bin
b2fbaee3470134632b73d0b23f7170752e30dccf0bd153b6ad8df50c0f9c00d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 17148 bytes