Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b21608fcb47846…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 18:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 74e41feb043cc8fa42d634e9a5b2c548 SHA-1: 5c1f08d6191d31cbb62fd8ea12ba62b4e16080cc SHA-256: e0b21608fcb478468887b154164dd8bb76c6cabf44e31315b149f5f5efe7c265
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://wastran.ru/uplcv?utm_term=the+best+app+lock+app PDF link annotation
    • http://redskap.ru/userfiles/file/nifulexomebugema.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/danojipaj.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zosegetojixigum.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/tepesijugajazegutevub.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3a01580f---47485154379.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/luvawarowereliziwo.pdfIn PDF document text
    • http://tzsunup.com/upload/pakov.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/48346324990.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3532a70d5---28933483797.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vajoxugogagu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2ae42f00a---wipavisovowomo.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/14962737943.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/71084682886.pdfIn PDF document text
    • http://rld-carbon.com/file/jamuvewafaxifegove.pdfIn PDF document text
    • http://wwsm-us.com/files/file/dagirat.pdfIn PDF document text
    • https://kimcert.com/E/file/4881292140.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vanep.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/71669523295.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/tekodape.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/88672446329.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/70855405803.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gefevevoxen.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/62673135740.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/29743045475.pdfIn PDF document text
    • http://packamate.com/userfiles/78057362712.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_off0000b7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B9 10372 bytes
SHA-256: 034b7e7b65d7f06c44e1dfc81106485d66a97abe496bf309f4b2c3d0eb216786
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 17100 bytes
SHA-256: 5038495437239275c1b9db26e74ee6e4107c4e898e3a8e49c59e7eb56cafdebb

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