Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a886292d6f282c7…

MALICIOUS

PDF

92.8 KB Created: 2021-07-03 03:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a41383732e5aa783422ba35152f70124 SHA-1: 33a3f7b448243abea33c39b62a64e25983f2ecf1 SHA-256: 2a886292d6f282c7296d8ded6c4fe0d081d57f04fe0d6530373b9c0901f5d5f8
156 Risk Score

Malware Insights

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

This PDF document contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple compromised domains and disposable hosting points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://huntic.ru/uplcv?utm_term=the+logo+brainstorm+book+pdf+free+download PDF link annotation
    • http://elsekmont.eu/userfiles/file/65446059741.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4049a82f11---73568272960.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767901d7e1d---tevaxuwogogivuwawibovus.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/genorox.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9cdd50fd530ddb8270e4d3ca86c5db61/89402411399.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5eanrb55l1e8hpi0amqi8m3rh5/zukemodepapok.pdfIn PDF document text
    • http://1careglobal.com/upload/files/95560803741.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4809e861ecba43084511dba363b40586/21981719171.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771c401ef66---birenepirep.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/46720133859.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4e194fe7---tepino.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ba7b8fc---98047281585.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/21m0df3ph0hkqik9f11rfhj878/37048314605.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5d542253---20290505422.pdfIn PDF document text
    • https://davaocarrental.com/images/file/7809988466.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_181224.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1jdibtigbd67h7ib5608uj8khm/jegosijerewajur.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/67308138488.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/34486351700.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076342ca7b02---wonekefifidiserojuvowowi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e46bb77c192c32c34e0dd3d0da61bcfc/muvumotaritapusufexo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vnu4i5cfct4esdi8lje6emhvae/jurow.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4483677e1d---34842876791.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/ganazifezi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 17964 bytes
SHA-256: 57ec1606160b8b283dda492abc64f03776058ab61ae8f4545be127f8c651da88
font_01_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C3 11224 bytes
SHA-256: 285aeea5049fa2790001e424f49423b40ae98d3d88fb7fdb94f95bff6e592a2f

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