Malicious PDF — malware analysis report

Static analysis result for SHA-256 6228eadde21976b9…

MALICIOUS

PDF

100.6 KB Created: 2021-08-07 03:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efa26bd19ba5f6cab4d4eedd0d087d8e SHA-1: 429d995ef0c6a6066d3fdba085e8ee5035261189 SHA-256: 6228eadde21976b912151966cc5d10f825190b0e78c19fbf0b0f1a507533a4ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e96e7cc73---47436332087.pdf In PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/10863920164.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gupesomirofifuliresigufo.pdfIn PDF document text
    • https://andana.us/files/files/sibipoboxax.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/zusitizozuzujeweke.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/81556698386.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/me785llld5p7rajgp57v52r6tc/50037086545.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b5d0df420f69a8c8e349a46757577e8c/liruleraz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b9c84cc2e9e178eae0870a92943156d/namulelafopijox.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/78293434709.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e87b3ea4b63---57753113083.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b97071c86---nozilununuwapes.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/kiwupekufaw.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/56918813856.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/76626984074.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/23700622401.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2f7ccf0f---lakumezokolodajaj.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/simidesafo.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///rarijudepaduv.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5676d96c5---60428246285.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38ffed1c9c---69481580866.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96966005129.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a54e06d8a---48440424387.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/rinuvevonuwonome.pdfIn PDF document text
    • http://darec.sk/files/files/3270358115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+control+bose+soundbar+with+dish+remotePDF 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_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10952 bytes
SHA-256: 664b7a0cc9411e238f07f2e23a2bc84a5554c39953c595178e654b5ba61961ae
font_01_sfnt_off00013b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 18536 bytes
SHA-256: daa67f3c7687835cddfbfaf8adb931917cb8c19f6347f01c1d4dbd56702fc75c
font_02_sfnt_off00016c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1