Malicious PDF — malware analysis report

Static analysis result for SHA-256 f274e8b9c9fc1808…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 06:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29e0a97bce6a615309f6be616cba7a2d SHA-1: ed34ab6ab11f4a958f9ee47771b7f0247fa9d779 SHA-256: f274e8b9c9fc180855634cc262cd964bcdd74896181c3ec751c5bb4f8ff26e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO poisoning or phishing. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hasici-pristroje-eshop.cz/files/file/23866240805.pdf In PDF document text
    • http://pantryscan.com/123cars/imagefck/file/87322903590.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/52400322741.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9946dc2b35---bipad.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a915b6d6415---6140405585.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i5mlakjb4t322h7iv2ebm2f2ek/74120982218.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5c7nqh4haa09ksan1b375nt913/49898435181.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884a8226f99---zurefekukofej.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607941b3caec0---lijomulisosizojuzefuwe.pdfIn PDF document text
    • https://bdata.vn/upload/files/13924814309.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/wevitamiwutorufipu.pdfIn PDF document text
    • https://ckmandarin.com/uploads/79272522766.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/69ca760a61241f506a848b75600ece67/zivezolidizatirobuj.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/mibizizoriniwi.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bawinunomulurig.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nnr6d6054i633hisru37ts3gb4/jusemoniwuwerub.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/xejerosuxebatiki.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3lhdnf4uspmr7nrdivlqs99ur0/nufetiwadufajosesinep.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1324ff7e---47323059751.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/latujogozajigijegip.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8gclrqq3f3susbsv4i4k8qhe1f/zuveti.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5i9j2d5i7jcge1jch1ur6p8viu/kafomebodunirixep.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd695945497---xovelemebavivobuxafejivo.pdfIn PDF document text
    • https://tdfstore.it/file/rirup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anatomy+and+physiology+chapter+6+muscular+system+coloring+workbook+answersPDF link annotation
    • 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_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 11644 bytes
SHA-256: 22f28c3cc877fb33f8ea38b1dd683e3d4e597c12ad1c0c31af7a48aa8e681209
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 19400 bytes
SHA-256: 51cfd2f68aee14670837f15e801aaee869a3db827fb03a31ca166b54398818ec
font_02_sfnt_off00013b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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