Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f33f9d0cc8e228…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 07:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b87eba59fcde87a05645896544f7076 SHA-1: caed481e268303c8740f82ed29643bce2513f476 SHA-256: 92f33f9d0cc8e22846a3a237ce380e871d5b9fae08afa6aa2be5b9fcd6eda8bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343eec10053---vikejojivavitusukowatof.pdf In PDF document text
    • http://abwhopewell.com/uploads/files/simogak.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/99883483498.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210916063010.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/wawixateniwavuj.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/bajubewofoselelavojabiju.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/91982816207.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/geripapopigogep.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mivus.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614117362bc08---57126290680.pdfIn PDF document text
    • http://esteel.my/userfiles/file/83120529470.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409f42a6cba---37967606786.pdfIn PDF document text
    • http://glassick.com/userfiles/file/97561694973.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/58787885787.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/89844839447.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/90074460674.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/13728187752.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/11986956289.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109071525417749.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/vobaxe.pdfIn PDF document text
    • http://ktcz.eu/files/files/vukoj.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/91046515694.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/55452891917.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/70249841758.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/pabukipepasamewudor.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/taputimolifesunuwanid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cheto+pubg+hack+androidPDF 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_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 10944 bytes
SHA-256: cf813cb5182339ca3939410fb76ed0d31356f4f930fad7cb63b7366bb67c3430
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 17112 bytes
SHA-256: 46a24fd9c2bd4cf447d5317b1761311712bdb98ae3fb775f69e3804cb4b7c694

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