Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe38cee3bc60b35…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 03:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fc7da11b2597e400e18abebbe3a056a SHA-1: ce17d6406fcd3e516c6689ec8a18fdba1d4af59e SHA-256: fbe38cee3bc60b3555c2442231b94acda0ff35e51b05e76cc5a5f400b4768c71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the nature of the file suggests it could be delivered via T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://szalkasszorutacskok.hu/app/webroot/files/content/files/1513619204.pdf In PDF document text
    • http://nhasachconggiao.com/luutru/files/bavinulita.pdfIn PDF document text
    • http://tabletopad.com/images/file/piwesujajomelefosoj.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/gasawifokisowag.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1de5a151---86195898136.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613952b78c392---mepuguzewowofime.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/sububolabow.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/12777083043.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tezigapelopavemid.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161387a188a74e---vefajipi.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/dewotabizarororuligoselit.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/tobafepa.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/navowames.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/dbcb3cbb5da022130f937315295a8486/kuvinan.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe15e9b14---bomiberevugemosunetebuzas.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210915145655521782wpcb7.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/11921090978.pdfIn PDF document text
    • http://chromavials.com/d/files/62615768716.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/nokuvuluxojov.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/golakapigusaro.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/fadelax.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/34236359719.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/geronotaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pre+intermediate+english+file+pdfPDF 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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 17172 bytes
SHA-256: 22ed8c586afd71cde3c5fcbbbe5a6370339eef01b6eacf075fea9667a47928f6
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10824 bytes
SHA-256: efc75beb4ec8a9d5855b45d95e8de7664278bddf67c93070e184a2ce8e6f24ce

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