Malicious PDF — malware analysis report

Static analysis result for SHA-256 4120a3989000ff15…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 21:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1068da0523e29d0abb0830b87f7751a5 SHA-1: 3944de658268b80988916785968d0b99614e07c2 SHA-256: 4120a3989000ff15bc96bf6c8b44856924401d8d355930738fcf475bb349c048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=miele+coffee+machine+manual+cva+620 PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5458253c6fdc090022d9eff1f995f589/13560884081.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc13c340a---kofadegokujuli.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/titizaterosazo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nofegenomujagefodavor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af0c5562dca---43837573660.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5b6d6861---83402059603.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/kikarulorekeruge.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/bewamoviduginabapinino.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/58098008747.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/9831b27e265448c0b9474e773d1857e3/5174861685.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d353162cd---1474281584.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607be033171fd---68878427571.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/solukexifenunejuluzijos.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e9dd84224---63095584710.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/46078901456.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/ritawafilizoron.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/82960135519.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702599a0217---xakuf.pdfIn PDF document text
    • https://bdcomunicazione.it/file/fimewusedofeforebuter.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe26e2270e---88283402125.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/gidip.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///poxafulamem.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/28953045747.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/92800643229.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/96055433706.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10804 bytes
SHA-256: e15b70104202dde305f04d75d84573443c5bd71b8c4b7749d2b2e00fbcfa27e9
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 17352 bytes
SHA-256: 6401f2af8b3071d959fc64e425d22c460186a45e089b67ea366b4f91faa5e1ab

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