Malicious PDF — malware analysis report

Static analysis result for SHA-256 5129602a4d76d13b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 08:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eacd332b5ddabb1be8c0847a327d054c SHA-1: 8a5379192778b1441bd3f1d81265ca9b4b3ec977 SHA-256: 5129602a4d76d13b16cd7a19040a594ae03288c515a0e1ac898ca40e10f4e336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=pdf+unlocker+offline PDF link annotation
    • https://doxity.ro/ckfinder/userfiles/files/viledujirelufup.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/zuruvokunexusimo.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/15547914496.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/16899911063.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/60701701327.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161339880a4261---151055616.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/47689839125.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/97775937474.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/50484683441.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/gumixejawewopo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/34886025780.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/popanomimunarefu.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/28520840396.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/jelidewaja.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/38779175d87bf67da6a649318eca0d3b/xugujokudebafo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a15dd10---24860280450.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wekaroxaba.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424bb7eea81---44884027545.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4e81b89---genizolub.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/xegasexer.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/sorodazaberupovire.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/83216584040.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/parewaterakegutawa.pdfIn PDF document text
    • 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_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 19584 bytes
SHA-256: 2d0213753fb817d6d383e6f64bbe4bef7a8012304b256c328849d9c4b9775d42
font_02_sfnt_off00012d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 10236 bytes
SHA-256: 84b6191e8d5959e1061e89df109ff313b9791d6da68abddf62a79a2d7ec2f6f2

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