Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea736f43f4f3cb4…

MALICIOUS

PDF

85.1 KB Created: 2021-07-24 03:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee65a4f5f6a349b6018500af349c2055 SHA-1: a946179e4e2e14732837b37173b3715b247fd618 SHA-256: 8ea736f43f4f3cb4e3391538eb499aea08830768d118b19d1e26785aaaa98fbe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/thn99k253508as0ff95fd1nnl1/43699997780.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/bureniwerako.pdf
    • https://cowichanmusicfestival.com/userfiles/file/sapokatonup.pdf
    • http://straub-online.ch/userfiles/files/vasumabefo.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/45dbe04123abffc81ae25e85af1cf3f5/39317562030.pdf
    • https://travelsafeway.com/userfiles/file/susepizesojilibi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f060acab---vobofurumokusi.pdf
    • http://banghetretruc.com/media/ftp/file/lagorunime.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5b727b5f---94464214609.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853e513ce53---43302059651.pdf
    • http://thefarmatarapahoecounty.com/userimages/21944780290.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e6b3ae198c610ee6e5c77aed5ffd7b57/rumokirefos.pdf
    • https://arrayamed.com/userfiles/file/niterixanokuzusemekeri.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd6821f38---nixadejizafufuxe.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160acead513507---83005891918.pdf
    • http://aaaexpressheating.com/userfiles/file/wisebezogamugasuk.pdf
    • https://eric-parnes.com/ckfinder/userfiles/files/35072255784.pdf
    • https://prosaison.fr/userfiles/files/powasurazilulumigusitub.pdf
    • http://casadiriposomarsala.it/userfiles/files/32220476778.pdf
    • http://baobiachau.com/luutru/files/40767061802.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oncktnst3j82j8np4pqli4nlf7/namovu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=el+amor+en+tiempos+de+colera+espa%C3%B1ol
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fb.bin
4efa085dd7a0bac98f6dfdf92816e0a22be30a2c6c82ed53536c26fe546264be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 10864 bytes
font_01_sfnt_off0000fdbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 16792 bytes
font_02_sfnt_off000115d1.bin
7fe0b1b10b4ec7edae792e688b1862e05cb7189c74383b8305f6eb5e03a82a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 17936 bytes