Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c27db8b393caf7…

MALICIOUS

PDF

76.1 KB Created: 2021-08-28 02:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dc428e6fd2736f8ff17135361eeb344 SHA-1: aeadf034224576a08f5f30cfa691cbb2d6bbd0c2 SHA-256: 89c27db8b393caf7e7e6d66906530044635c8cc103830658cc1f0bda34e0ccdb
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect victims. The PDF's structure and embedded links strongly indicate an attempt to exploit users by directing them to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://styropapex.pl/userfiles/file/vazifenedotugaxifa.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4179d6079c89a5a5315b6b8ec22b41ac/79373429566.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/12483074188.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zobexasaparekibafe.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/luloliperijibase.pdfIn PDF document text
    • https://cargotavio.ru/files/file/jaragomofojepe.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosif.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/pagoxipidenujojevewenugad.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0193da93---tusiparito.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7b7f4019---lotudomosuzaz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797bd7b2cd---46088552854.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xujuvomoje.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/wisapozotofonuz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b9a0baa2---60188596825.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dfcb70190---41708127368.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/36hv1grhavm7hc144fh696mj01/49033815714.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/xebutamowimem.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/26954480236.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6331ad7e706917dd14f667d2057f0a8c/rotekixadubaw.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7ab2554daa5be3c38d0ed1761cc27357/zukajovusabikuzagaduv.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/01c78c5becd114f6769b8bcb3229c89d/86916409347.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d975f5d3c63---xozewakulijezerevib.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c6cd03004ef96e4c6dcabe6ebf4cc1cf/5357300266.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dadadc06e95e35a944f53060598cf98b/210238606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=29+states+of+capitalPDF 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_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 16400 bytes
SHA-256: 95b05372d4a9a77dde1097346c43e50e9b014aa68bcdf34a8729596b28f46c2e
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10460 bytes
SHA-256: 94b21402ce1383a02a9772f1c4caa5cf8d7e9209f7dadb68a1a3785d18e1b64e

Open this report in the interactive analyzer, or submit your own file for analysis.