Malicious PDF — malware analysis report

Static analysis result for SHA-256 398760c37cad634d…

MALICIOUS

PDF

67.2 KB Created: 2021-09-26 01:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8eab91a4d1e4aa7fd393b353e35d139b SHA-1: 01b537c825d66c0d17b5ee310c3adc6fb2056ecc SHA-256: 398760c37cad634d4bbf7ac5a2303b265192f84eb1d89e1ccadf649bbfd54a3c
116 Risk Score

Malware Insights

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

The PDF is identified as a malicious image-only lure, typical of phishing campaigns. It contains a large number of external links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used to distribute further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sealordhotels.com/ckfinder/userfiles/files/72925478551.pdf In PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/vekonozevuguv.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/kewawipegakipebotelaketi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa31c3a247---ginime.pdfIn PDF document text
    • https://artbynela.com/uploads/file/giloketakamokoxewu.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/vemodebodavalajes.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760442997---bofadirakivudaduseget.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161343a961e4a6---95795791638.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/wabesimoxapasomug.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/53277280457.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/35097090252.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/nexanovifedunu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143930c55842---42734423451.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/47034008145.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/puxaretivofibuzaxa.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328a40366c4---sudalik.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/tarokedonibijijiketalo.pdfIn PDF document text
    • http://youil.org/userData/board/file/tanelojajatasodaxojo.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/dojetakapefavepujexi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/livaxutiravu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/58720248468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dr+driving+mod+hackPDF 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_off0000ad1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 10532 bytes
SHA-256: d798920af257fb0e758c0644d250c4bc42e0884ccfdc28df20bd6e96df703476
font_01_sfnt_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 14248 bytes
SHA-256: 7455045c48bfb7bfc66eb194dabb2c97885dedf5785a852c47d76668457e0f4d
font_02_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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