Malicious PDF — malware analysis report

Static analysis result for SHA-256 2005353b57df2f5d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 07:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba1976ab660e5623a413e191d532b528 SHA-1: d27151e3be9d2f4e444c8c5aa3a684322f97c689 SHA-256: 2005353b57df2f5dc14a3e2d62486f61d5366f5524734b0541afbf74eff94673
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://osteriadelcampanile.com/userfiles/files/nejezijepafogokofivoroba.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed53444bbc---32933263439.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/84792862074.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210902122618641.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jopapowovi.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/61939914409.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad4b8f1f0---zutejonutejokonogewofexo.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///rajapiran.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/5117438937.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45991590338.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/23767910729.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/3822767599.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/75339416677.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/67320298518.pdfIn PDF document text
    • http://nemochem.cn/upload/files/radevivasufexulomonuxum.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/66263484506.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/98288416771.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/42353721818.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/lebit.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/pukujibuzuje.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8e26c550381a0802ad683ec4a020d202/samusorukaboz.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/31662414665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hip+hop+beat+maker+pro+apkPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/93255748517.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 10424 bytes
SHA-256: c85b4965f05398fec393c0eda67556c20b350e900886485ca2ca140dfea37f56
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 18892 bytes
SHA-256: 841e21007c8a3309bbf769bbf40f5389b32b09a37f8618ca09716d7d0b7d4251