Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a7611f6a538eb5…

MALICIOUS

PDF

95.0 KB Created: 2021-07-14 02:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a80afdd70fa59ec215f930d18c54e004 SHA-1: 4a62c9fbb8e6460e69d8efaf6891584631dce21a SHA-256: 12a7611f6a538eb539e4dedd73ad12e6fe3bab443ef1c6d853d8623d9d3c69d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://chcial.ru/uplcv?utm_term=dtw+to+puj PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609849532c62f---82434366134.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2e25aa83---50962516206.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6262806a5e---bipefafomesajebofafami.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94bd0baa6---gobofebezosujomomumolepu.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/gagewow.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d14d4d55---nirir.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5oljt5l88mkbsfbgldodjfgq5u/12551903788.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2kamrr1rjmle09e1sd0l28jm3k/38488335503.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/46152177910.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d919dda8---54334574825.pdfIn PDF document text
    • https://senfina.top/uploads/files/wozeja.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/xexulisikovibowoji.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/lelavoralod.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609954bc20b3f---69960726552.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e89d2276---fudefodivawug.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dl5o6d0ntvtv81cjlado90dq61/nujaboronujodaluremoxubug.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gelarasewisa.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/9635534549.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xawoxiganoxawalonupeva.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d942c227e0---66915990056.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d6c4e099ea5c8c375a8a54c56c842353/43251099206.pdfIn PDF document text
    • http://yuha.be/_files/file/nomununetodebutudo.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/mevawub.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bef7991f4dd---78546510917.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/semibuzokinirevapejejes.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c61d6e2e3eca88e5be15df45f39c61ed/wijexesusu.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_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 18940 bytes
SHA-256: f5d49a8cdc217b1b17b4d90c8bf570ee6c22fd55d5b64b9062abfea81ef0bb3f
font_01_sfnt_off0001413b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413B 9756 bytes
SHA-256: e60b46d8954994b6140da9f8a59e55604c1edf02b57b9e818c39919169c9fd4a
font_02_sfnt_off000156b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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