Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e258f5dbd3fada…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 16:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03fe29fac0fe4f7e7f3be2b404bf5bc4 SHA-1: 326ef573758ec4ff434d66fef0705db6cf6971a7 SHA-256: 81e258f5dbd3fadae5dffef52e4946772685dc7d60afd9a3455172e7a58aa146
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to malicious content. The PDF structure itself appears to be a link farm, designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c5a48f76---folozisivupuxuzesipo.pdf
    • http://zkojicin.cz/userfiles/file/defudivofuze.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0364139e3---gatababegedesovigodidi.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kl60dcqqkb4aef7ue1fmerhf00/21937433304.pdf
    • https://stopserv.ru/files/file/mupujek.pdf
    • http://slippersymposium.com/clients/875641/File/28654023290.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jj0ddvnel93mokhckkr9s2fsa1/18379026963.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bfaac9454---nanewededagapozegobure.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf0847176---gexuwugu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7c9de27bb145bbb2c6217274aefa0d3/kefuzina.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7ff60868---63446591832.pdf
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/fozamoji.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95199b5c3---naxiderudu.pdf
    • http://hilimall.ae/uploads/files/raxesef.pdf
    • https://amatnieks.com/pictures/image/lumev.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080917c96fb3---2439742856.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vatfg98opkqi23sa9und2n4eh0/73315645125.pdf
    • http://shinies.ru/img/lib/file/86682310169.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/19htfr1vobeme6i4cisg3jktb8/65851825802.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d05aa75---laxadoposo.pdf
    • https://blnk.eu/userfiles/files/tavilemavunidiworasujuk.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b32eaee006---povolijamafo.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/34d9235f82b943eff7ca4e223e330fcd/12439918722.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dhal+recipe+for+chapati
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ac.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 1824 bytes
font_01_sfnt_off0001093d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
font_02_sfnt_off0001214f.bin
c0768f35932718eccd28e966c6881b647d583106c14b5bf1f638b85f64d622a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 18820 bytes
font_03_sfnt_off000152b5.bin
238badf750e391949a476efa319ff287af160789fe4a48f7fbbffe3f594c4cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152B5 10308 bytes
font_04_sfnt_off00016a08.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A08 16684 bytes

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