Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5ea360b2b9cac9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 08:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bf97cde9d02359ffa079632d602f5df SHA-1: eff577372623f447d5d27f3233651b6038405349 SHA-256: 2a5ea360b2b9cac99b5f1e4c18575fef82d1f2558d4fb8441c43f17f9372e0cd
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://laborke.ru/uplcv?utm_term=victony+1200mbps+wireless+wifi+repeater+manual PDF link annotation
    • https://rlmahtani.com/userfiles/files/12882356947.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///29237729100.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112a06426ddc---18758168635.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/29094631262.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fa118c577fe0ebdc573802dad3b4b1f2/7925600299.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c9b44ec162f0ec068635fad50740f815/63452298662.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f495d9457a---kovowisimajugugas.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7a829b459---67481901762.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/glv4b01g17dii3n2au9kub5o4r/79572254637.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ae0af3e34---pobokevokunuwin.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160363f1730---11076023099.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/78337936661.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/wuxapakino.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f888f63b6d20192579b65f16b36784a8/74807842441.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pph0embgietm4fhhqpaghmp3c0/maluripemumesewa.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/pisofebifezesibevopax.pdfIn PDF document text
    • https://southafricapools.com/contents/files/13107971792.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/merobeja.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/logatejoserunig.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/zamujudajawide.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zadekimuj.pdfIn PDF document text
    • http://lse.hu/userfiles/file/48396722112.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b79bab7fbb21a1dda164f703a13ab64b/24078400941.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ba910f44e---zated.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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 11344 bytes
SHA-256: 2c998291ed8740b37e7686e3fa2fe9849048211603366cd67a857a60afdd1370
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 16840 bytes
SHA-256: 68710500fb68de7d38a0e6d6d9b1b13045519460988c5976bd909483ab69601d

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