Malicious PDF — malware analysis report

Static analysis result for SHA-256 8177963729ff14bc…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 01:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a6d02c20476c5161e4e47cf3ef31c7a9 SHA-1: 2aeab52b93273999e1b684233ce05b153ef70ef9 SHA-256: 8177963729ff14bc492326a6e1a6597b7106327da01c33987643c3fd78b96bcf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The file's structure as a link farm suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mallncart.com/userfiles/files/67796777943.pdf In PDF document text
    • https://santa.sg/images/users/00000000/files/zarosiwux.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b253babc3e---rekega.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/fokaxo.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/71910958466.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/83181969733.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ccs38ua5c9q46dgl6d1hrrpgo5/67201975277.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/83262217147.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///55876162127.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mivix.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97900645622.pdfIn PDF document text
    • http://beta-rc.com/upload/files/5876908638.pdfIn PDF document text
    • http://caythuocnam.org/images/files/sufapinakubofunivomufesi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c334d07f---xezudozawosabutunapunolaz.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/ledejijiwuponawewewon.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/rijiv.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/44615636734.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383745e97a4---kizudoselanex.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfd0b6472---56601326939.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/puwexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=odd+apps+for+androidPDF 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 17332 bytes
SHA-256: edea8f4f0a761cf8481528f90fde91eb7688c5bda5c06d56c5e29f4987a1b787
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 10240 bytes
SHA-256: d06952930a8162b4f3209b5e765873c3468560596378f67fdddb338a6907c007
font_02_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1