Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cbcdcdf54b7aab…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e41b4232b8714c3e96d5142c7d5f5d1 SHA-1: 1345ced9307d832deed07e3b3d3a4e5ccdb66359 SHA-256: 92cbcdcdf54b7aabcf9bf4107066521fdc7b2d4d1d12acc69f02b066e0933143
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=esl+worksheets+for+adults+printable PDF link annotation
    • http://cherriestattoo.com/ckfinder/userfiles/files/90275171867.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tomutowasarojadopiruzibe.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/puposamuwaxidinaxuz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cfccdb284fcb124ce9b41095487ec121/vemejesabejibi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/299ff89c73689a42f2f4b19de0bb1c32/73204644607.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/79652688555.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/46b78ba840cb756b44238e452a5c3095/muridonozexevof.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/73273912348.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/26980692889.pdfIn PDF document text
    • https://electroagro.es/pub/files/68368703864.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/retol.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16e299c18---buxigerevubatu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730792d9b28---bepilatubikikiturazo.pdfIn PDF document text
    • http://aa-nusd.jp/medaziwodinoxabikozil.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/gedarelorez.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e47dc13acd24f808cfc12f1a24ad2a75/zebajamerixelevijuzasen.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/45179433461.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vetijibelowugakexamog.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa84fe45ed---48730615379.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bf2bc73b1ca52384fa23b079cbd265c9/vajonapore.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607210402dd46---sizirufewazakifanebujegat.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb0bcd4e2---vowakafodanoweregesi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/936c29c0f94f698815128c830cec07f5/fevunomulajevix.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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 10996 bytes
SHA-256: cb2a3a8ccbe60b027818565ea89db3a5d4edcbb74e0daff54ee09b343aa8c609
font_01_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 14660 bytes
SHA-256: 6b2f9880a1c5f5b5f32263a4c4be6c4416564573635120618d659adf54091cdf
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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