Malicious PDF — malware analysis report

Static analysis result for SHA-256 456e1e439f6c92e8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 21:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49da408e648574a05f6a5c86982eef03 SHA-1: da4deb23172b86921974c2e1719e39f7cee66227 SHA-256: 456e1e439f6c92e8ea0434ee90ccac0391b831598ddd199b2a8601d81ed9ef6e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute malicious content or for SEO spam. The document body is unreadable, but the presence of numerous external links to potentially compromised domains supports the phishing and distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/53695466610.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076297be92b1---86661818918.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9b9fde18b1f5cedbe3112157ce8f7ef1/jumibonetakafuxepiru.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/bilekoxufitakuvadunata.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cacb6cd89---69603384921.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wafovipujoperenadal.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/70630915211.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sai41cfnhssmnrshn3s78qtlj5/27229990277.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/7887494601.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/wikadusa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbc2b3fec---76762032530.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/92865446786.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c6722lmkm8p56k23957b5o4d8f/41039836463.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a7ed854f---2477000270.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/lomagodunusafegexatu.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/72535490343.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d0bf1c3d733984cece0ccbb99f84a970/labugewazajabasimileniwom.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e4bfdd2fdfefe7e8afb0d172f455862a/telupimefevili.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/wetumer.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210602_71F3CEC173C9DF4C.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e1b2004c70493ec4c62828de0281858d/vilapomeme.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/daduwatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+kt+tape+for+shoulder+blade+painPDF 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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 11004 bytes
SHA-256: a4d46a2cb2cfa94abc140629140768e96bc1ee12df49d90fa7020b5030894d61
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 16592 bytes
SHA-256: 79e44695767398075448eef629de3c6a89a74af90bc8b8049900fa23e45d74b7

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