Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a4848b95746a9e…

MALICIOUS

PDF

97.3 KB Created: 2021-08-05 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d481679afb5c35ef04291757f68e69b SHA-1: 20e1ce959aa588452ef0ef5a90957bb04d6929cf SHA-256: b0a4848b95746a9e151fef2c219657b23f77e4a22f01aec806ad3990cc4e2e2a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to external content, which could be phishing pages, malware downloads, or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://cokhiminhhien.com/media/ftp/file/ditibesalunafonazikare.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3fe0323e8577d0d11a46dc565f80b5d7/sogogijukiworisasaz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55a03654d1---lijawazotisumoninatu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/togifu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oooar5af8jsbe67r77hrgob1ih/sevafimotapanofiso.pdfIn PDF document text
    • http://charivne.info/images/file/vaxenopilabar.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdda3baf8e---1386175961.pdfIn PDF document text
    • http://strandedtattoo.net/file/jilibekalatogexo.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/powebuzikafis.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/50325472671.pdfIn PDF document text
    • https://coil.hk/upload/files/sidamikubufudexami.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xokode.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd30391cd1---79146366390.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e861451dc242ce0b8a6a327f036ada74/64227766962.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52e75d5416d09449dce6b4c61baa1f0d/wegafegufoloxivozotadapa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e8931cfb---17198892572.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210613_E7C85B6CD2658ECD.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3963ed9e06---gapafujotubes.pdfIn PDF document text
    • https://egf.tw/test2/images/file/xewuxefedoraxaxenebixixi.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/xikujipuvisa.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2379a65063225b2b6d6c164f6ae8724c/10065606978.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wigeruvebulutapokogisopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lean+six+sigma+approach+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dd7f3ce5326614644de7c35687324c27/savajuduvumitefajigeluk.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_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 17436 bytes
SHA-256: 9c4f55d95771265ef8e9c554e60f40c9c700e0861975ee17be3ea40437dc98ca
font_01_sfnt_off000146cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE6 10984 bytes
SHA-256: 5f3ca0ba8c4c9f1b5b1be785729c5192a8ae7afbb75875448dee956059c3b8bc

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