Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88b7cf4ae14dcde…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 06:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7f6d904bc3a39f71dd0c72ec2f65438 SHA-1: 279bbda0cd02351f58477a4caf8d4495483fa077 SHA-256: d88b7cf4ae14dcde1ecc28e37eb10a2f312eed43e2ef25cd473407166d64d04a
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 disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link farm further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://coytex.net/ckfinder/userfiles/files/tulibobikerodabez.pdf In PDF document text
    • https://aymsoft.us/aym_image/files/2282620696.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/5250068250.pdfIn PDF document text
    • http://cartopack.be/Images/file/mibibetarelilukesomus.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/71208001770.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/21031156546.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/pumox.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210916131720.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbd4c6249---40650195406.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/79351870611.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/93817817542.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mefulomi.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/bupisomupaguvejemimonu.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/91519783016.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/84262670949.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/51042099007.pdfIn PDF document text
    • http://sga.cc/uploadfile/file///2021100315552287.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/seroremikatimebejawoz.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/lomosogusilonabijozoligat.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/74410069053.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/10428284671.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/fbb48036648f5aa682dece4cd7e0343a/84426736671.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c556a8535---nodobirulufina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+ophthalmologist+brooklynPDF 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_off0000b0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 11096 bytes
SHA-256: e157d3c54438cd188de9000b3e68eb232e7d93488ea4e41d1baa3b0b7c157fd1
font_02_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 15292 bytes
SHA-256: eb5722198c01c5f752c3bbf29963afec1b3c9ae5056c806a437804388a49a123