Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bf8035fdd4fbb8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-11 21:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd1a138d80796cbc0dc9a0388e42de19 SHA-1: 238062e58bb15c4a4dd30e16148c3211c28d499e SHA-256: 31bf8035fdd4fbb8b355ef5d149b00d16be45cced24142e791cad7a0c79f3a37
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports a phishing or malware distribution vector. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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://ipea.kr/userData/board/file/gefolomabave.pdf In PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/76901445733.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/26434922645.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/zibexixidobilu.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/novufa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137dcfa50498---63045760716.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334c0a621aa---70405108479.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/59393529988.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2e01b0f7---86169505992.pdfIn PDF document text
    • http://pk.mo/userfiles/file/dawupuwudikozukuxajumuzi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135061a7cc17---60519102898.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/83512622021.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/tekaz.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/putuwew.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/julododamegefijis.pdfIn PDF document text
    • http://standardamulet.com/files/files/28378748297.pdfIn PDF document text
    • http://schokofontaenen.de/idata/34439367219.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fowubefoz.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/pukuwuxuge.pdfIn PDF document text
    • http://okvin.org/userfiles/file/25429809037.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/41772224027.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131893bf1a79---62077565123.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f12b65412---zobefupupaxomuvenusodis.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/mekolakomawekimufosumo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/97151192956.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/donolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=my+hero+academia+season+4+ep+3+eng+subPDF 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_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 15136 bytes
SHA-256: d92f666d4ccb19b4035ad29fdf72c09ad46bbda329dfc9fd445e2efa75ee8616
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 11412 bytes
SHA-256: 459cb9478c804329b53dbbd7ca53d59b96b1f51834bcf1fdd964be05eda45db1
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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