Malicious PDF — malware analysis report

Static analysis result for SHA-256 117f50ad9a81b147…

MALICIOUS

PDF

98.2 KB Created: 2021-06-30 22:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0c6fa952acc4d7ba6585fe239fa2149 SHA-1: 3c3cd6583adf2136c8117c25e09a03f2dd50dcb8 SHA-256: 117f50ad9a81b147f0f8b63d1c649d7581b59baa53e0bcf78ce0c09baada9a51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external PDF files hosted on compromised websites, a common tactic for SEO manipulation or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://windmill-bv.com/userfiles/files/kufosusoduwulivilita.pdf
    • http://vtvxm.vn/userfiles/file/losife.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073639948b53---69980224990.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2a3ed1cc---lowilifa.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da3a397606---tokupapefazunup.pdf
    • http://phatnang.com/media/ftp/file/62563842199.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1433b955b80f4957e1f75866827a9acf/61231483149.pdf
    • http://happysmilecard.com/uploads/files/diwatepafutazufejo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160912b8005d92---44438392208.pdf
    • http://toyteepee.com/uploadfiles/file/210522171254793999h1230c.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd05479504---zusikumogabexajusinam.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771b68a3e11---40085999701.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/786b8d63c65806c8850898cd33f32e60/bitumevotazedapedob.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e602a971a---40559218298.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a59840e6---dozozino.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/27c7c0b0e4737f60ec78e39f9cb688ee/xuxuwezojebo.pdf
    • http://zlato-invest.cz/upload/files/xexofemezalusuzekok.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f17db129b32144efcd7272d229e827e0/kipofovunasapekuxu.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/83590088844.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/zavolakezaditamedixepeko.pdf
    • https://aspirans.com/files/file/6299887675.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa248d5eae8---81380868328.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e4f3d122---13063833380.pdf
    • http://atek-ent.com/upload/file/40107482958.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dreamed+or+dreamt
    • 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_off00011e78.bin
f24b674807fa3f8768e37a3ad750e6b825cdcada48e24ddc9a104fc3dc4d3ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 17564 bytes
font_01_sfnt_off00014c16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C16 16792 bytes
font_02_sfnt_off0001642d.bin
a2799e8980d71d74c169ed8947700f9ece68b655c9bf399d3c8aa84953c1d4d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1642D 10000 bytes