Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fa724c7075c7ac…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04742dee883ec39dd220d1a9db0c99c9 SHA-1: d92a6e45913c152a11879feecc836e5064a2f666 SHA-256: 96fa724c7075c7ac34a531f331e97d3077f5403efab3e0fd5170176f5581698b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=wwe+revolution+3d+mod+2k19
    • http://stihoplet.by/upload/editor/files/3563958719.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/f3umpm1nohgvugfb2vb27s9v82/3614060034.pdf
    • http://www.frank-diagn.hu/userfiles/files/gimunomijepavaxeruzabu.pdf
    • http://sjhrz.com/images/upload/File/43195774915.pdf
    • http://profil-metall.de/content/uploads/file/35030566241.pdf
    • http://www.casasemio.com.br/ckfinder/userfiles/files/38785059647.pdf
    • http://sampoernastrategic.com/uploads/image/files/56208566864.pdf
    • http://bkm-market.net/userfiles/file/gibufewigamofujolozogodu.pdf
    • http://herborgthailand.com/file_media/file_image/file/nutetu.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ec7d6be1---bobarajiwe.pdf
    • http://duocthientam.com/uploads/ckfinder/files/buxowilonubinuzukotoman.pdf
    • http://prtourusa.com/FileData/ckfinder/files/20210925_8ACEC7B885E4AE45.pdf
    • https://nslogisticservice.com/userfiles/files/91558931216.pdf
    • http://billsky.ee/files/file/79351479724.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6ff2a4ee---gomixuwajogovunun.pdf
    • https://shaksheer.com/app/webroot/upload/files/gufiweredelozalakazuv.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f75a5473df846f4a75477d74b19c160b/xupawudasifaweba.pdf
    • http://robertoantoniz.com/resources/original/file/64837289451.pdf
    • http://bftt.marketsearching.com/upload/files/zovelukarejoz.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/81238317955.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/98011211368.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/78306674442.pdf
    • https://fallsplat.se/bildbank/file/bigake.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b086.bin
bced80eacc72ea44146029483bf445b2324e04cec05b710b0b6d26e7bae3e71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB086 10928 bytes
font_01_sfnt_off0000c9ee.bin
d70846c8817a30ef530aef3edc7f1f6784a3559301595e4ff1391c64867d50dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 16308 bytes
font_02_sfnt_off0000f357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16792 bytes

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