Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a1cbf0b9d7b01f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 17:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b831b8471fea976800b2a51307f5018e SHA-1: 25db0c363330073dc09916dc43832be6711e3dfb SHA-256: b6a1cbf0b9d7b01f0b266e459aac7cce93cfa21b26136c586a22eb6abcd4abb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the document's structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=insurance+surveyor+exam+question+paper+pdf PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824d185814d---3946578228.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/43021912841.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/262e34a13cf23674b00a5c89258f4c6e/73102230129.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c0f6aeae---zajulasodoxotisegem.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/99425874889.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/12592815146.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/koribedojenedudisotu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/dobuwumab.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/525729ee3100b7b220bad11782390b8c/5118666141.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210620_031923_3210.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/dubekimusivaxaxaw.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vufituje.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/60599142605.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/suzifuvesemasimovonup.pdfIn PDF document text
    • https://digireg.ch/upload/tivifarasoverudesa.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/988405324.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/1171413730.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/41089778842.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec472f24ae---xibokazu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075862a856b9---zijunig.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/iq6aqf9hbpp10iaj8kqoq0i044/xuvemokepizezekegudetuf.pdfIn PDF document text
    • http://trevorhannant.com/83198322233.pdfIn PDF document text
    • http://sdes.in/uploads/febogomidoxujiv.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_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 11212 bytes
SHA-256: 07a879d35bf7bd2f8d49fc6b8084d94c18f7f92cf24f1fd125180c25197a7d0f
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 17244 bytes
SHA-256: 43330d1f2c852839a1b547891b879a3cba1a05ba0cf4599053c266de2c7c63dc

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