Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f547227276708f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 08:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c67a01445c0807c052e31d5f1a736cef SHA-1: 633f78cea3f47bff8966b48fdd427a13e9b0fbf1 SHA-256: d5f547227276708f7fd52e5b6ef9719de9b9cc06761764e2c327eab9458dafdb
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. No scripts were extracted, but the sheer volume of external links and the nature of the hosting domains point towards a malicious intent, likely for SEO spam or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=progressive+tenses+of+verbs+pdf PDF link annotation
    • http://chiari-web.com/ckfinder/optimist/files/tegadug.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/xolanupaje.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/jogadidabudofumaxise.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/71982099422.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b50feda502376797220653401a0e00f0/68440094995.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/59f887f598eeb264d769a967dd1b4a53/fazapul.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9245cd7f7---lowolobekodaxolot.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/nunosarijati.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/8541337096.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/sobivusinaxodukakurosu.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/042151344575.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dekofifumet.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/86916719696.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/79012721747.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/xixebogediwezura.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5k4lvahnur74l63igj9d8jresq/fiwetowe.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mj9mv68lu5rvgobf0m6qs6tqf0/papozunetoximajotutafeno.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/53804081727.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/zugafuwagokoduwefeweti.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/44820926779.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/55987689423.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/tesijejadosodoxisowew.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2ec5633f92def802b09ac2b1125e8e1a/mamaxutopokopugopon.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/635c563a33a9964d0bd408171daf2700/42992304215.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/wunonotuvolibaneta.pdfIn PDF document text
    • 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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 10672 bytes
SHA-256: 468c2dfca05cf76187dfae6a0773e5b92331387eeca2dc6bd0302f17af47411b
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 17844 bytes
SHA-256: 1d3e6631833ff46bc3dca669a0c1689b04fea935ba6c35b182ef7ddde61153c0
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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