Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb53c1cb7e45c6…

MALICIOUS

PDF

79.1 KB Created: 2021-10-13 00:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d29a0ec7ac478a0eb789f75c95368c91 SHA-1: c87d8dda7182d0acaebacfc9c49c0a0d0ebd689a SHA-256: 79fb53c1cb7e45c6ecc04b9cd2e579e449e46c93453a9268447653e03c1384d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/18262475701.pdf In PDF document text
    • http://manpukuorder.com/uploads/files/bikebewaruwipitanenen.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/64044163269.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/87342269853.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/mugukoribobejewesonok.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/91165135730.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615d1db411124---fibawigukuzaro.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/mozofuluxigile.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/vosilijaxemonigalig.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/97671040459.pdfIn PDF document text
    • http://hun777.hu/_user/file/29683179335.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/dobojef.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e614f4d6a2---53789931797.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/44ce2b6a3a3066cda6530bcca2f82011/netiwewexugofesumed.pdfIn PDF document text
    • http://mlead.net/images/e/file/newufobovobanusukupe.pdfIn PDF document text
    • https://sino-islam.com/upload/file/221107158285.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210911201632.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/58836714561.pdfIn PDF document text
    • https://onlinendttraining.net/files/fipoxijorimezuwar.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/sapumudaratupesufe.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/68272458377.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0dc2708599a168e9647b70d0d269ad29/ragilubobunafi.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/62316646955.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/ledizujirux.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/12694470756.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/tosunogizola.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=college+first+semesterPDF 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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 18440 bytes
SHA-256: 49d3b97effad1747d0cc86118641d02d2113bdeb417e385a2a87f23c928c436c
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 10320 bytes
SHA-256: 74ec479cff6aa894d9d12d9c36ed96438c767378b615cc7a13599ea3afb47958