Malicious PDF — malware analysis report

Static analysis result for SHA-256 280b36f444f75fd6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 11:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cfe8ccb79b56b032bc47ec42bf685c19 SHA-1: e5c5c91c5336704ecd43c364f853976096def8c2 SHA-256: 280b36f444f75fd697e9e8590ec214afc2b93236b9b1a1e106b0a5df6ebdcd43
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=los+grandes+pedagogos+jean+chateau+pdf PDF link annotation
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/1317922411.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/jibutedip.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/26332447772.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/75148512181.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/memoda.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/82107115625.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/15745200312.pdfIn PDF document text
    • http://ellev.fr/upload/files/rebikomufaderif.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907060123_h68v31.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/mobunamosesini.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/95376764864.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sefuv.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tanufopajamijexof.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210907222531_2134271034.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/91951256775.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916000137534941.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb61031f0---lozinibovizobal.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/78011674825.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/dugox.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/89227755695.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/98074843646.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/19847647562.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/74085034158.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fe65062023a67a6c135b75978bb4fd6e/wivinazezipuzavifafajiw.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f8c9e0754---64645761955.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_off0000c108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC108 19776 bytes
SHA-256: c11808e68a41112e359a8b2a2c09e5f634c0d2c03fd73a0d7a91681ecba4b6b2
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10948 bytes
SHA-256: 0ce08d3d452d89d699aee7fce7387377168912a61e83d4d81d9f18912ade3004
font_02_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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