Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef30e1249318488…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 16:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58222d26a049e97b8468877a80b01ebd SHA-1: dad42514e21ed7712bb1692d09e3337bbc5560d3 SHA-256: 3ef30e1249318488d582dffd185666fcba3fe3dd39b3046c54453ca97d66b673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://meble-tk.pl/userfiles/file/37763410205.pdf In PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/kijurezasokelufukama.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/ruxixakevamesitusagoxun.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xufajuzadoginepekaj.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/43301904413.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/votogo.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/58765847000.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/kubokabo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161429c9b76f32---fuwamanatelilewalex.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a24a0cd65f60c73082763811eea4ad4/61436564040.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/69185743533.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/4058421753.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/42234923149.pdfIn PDF document text
    • https://ksuskalology.com/images/file/xiked.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gokizifiv.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/91989336557.pdfIn PDF document text
    • http://letdentalab.com/img/files/65751782177.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/21462334354.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/81600887693.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/88619184817.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/47244682958.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kidatexida.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68258569030.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/80928773329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=train+to+busan+2+peninsula+yifyPDF 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_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 10788 bytes
SHA-256: 2edd274e936ed473714aae296afc71268411346ab218d1df826f8b13385f3d06
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 15364 bytes
SHA-256: 80934bb1936836a200746057f58995855231e01a127cce9c278d7a83c84518b7
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1