Malicious PDF — malware analysis report

Static analysis result for SHA-256 4857b92cb63182c5…

MALICIOUS

PDF

83.0 KB Created: 2021-08-20 05:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c77811a3b53555fdbf27c2e94679247 SHA-1: a1989acf5906853b69fbc8b664b7ac3dfc9603ed SHA-256: 4857b92cb63182c5cae5531e34dc93f340d54e6245eb21e816381ed9083a0617
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://wastran.ru/uplcv?utm_term=letter+cancellation+worksheets+pdf PDF link annotation
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f7934bb20---76171501391.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609907eccb28c---76031042596.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/af2319e373ad4b155af8b81ebf1420dc/6415116390.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210619182203_jw97rp.pdfIn PDF document text
    • https://curvy.tw/upload/files/11473827749.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5af422e1---rizudutoduguz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/43f14e2b1402f43114f23fcd4c326ac0/zigufetem.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f77d73b40f580b5e154caa470bf9c3a2/90797677246.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/muwalekakidavebapavatitut.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/naputelewomug.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/povegominawavopumuduxuru.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/tafitigarozujuzibipab.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/derug.pdfIn PDF document text
    • https://tomas-music.com/contents//files/fepevowinowudezuxaduvojak.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/rukuxadopivivulaxapem.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/29069042161.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6529bc06---44807539336.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/matot.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba3ad15f8---duwobob.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/mufajusavudefenetipis.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9a38fdf9---39038584238.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/7551100488.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/62611956634.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a13e579f0---47107778038.pdfIn PDF document text
    • http://airsoft1.ro/files/file/guzesituvajejanil.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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10852 bytes
SHA-256: 87cecd1b657e6f592bc3bf8c6d0004587d293c4bfdfb083ca3656923d71ff18a
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 16564 bytes
SHA-256: ab9ae99c2ea76bdbaa5039181b64467515d49564df2c2a9b928ce31ea3e60351

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