Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfbe0583d941551…

MALICIOUS

PDF

127.7 KB Created: 2021-06-25 20:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b940c62f33649cf2dc90d90c2a42a56 SHA-1: b0de443abd7a040a083f194c07dd3962eb7b7f10 SHA-256: 3bfbe0583d9415512e9b3f192fa4ed6d2ae72bc40d0ddaf74d02a4ee15a42b7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b8c89feae28783d6d3240e9b646db1/19005601854.pdf
    • http://humanitool.ru/userfiles/file/70771240879.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/015839d736926a24981b03c6d08d8a05/52212558880.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0240be77---84788001331.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec8e32987---76345953791.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/62738296122.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a3cd3920---wukagegowakosazilulo.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b1eb69af---34330068066.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/mejabiza.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a067947bed42d06db637c4694283d844/97231240512.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b4f10e61---jegojuvogugurojeruxizit.pdf
    • http://dajuicebarus.com/uploads/files/jafafote.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12ccf231b---lomomiwipuwereguxu.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/babogebuvulipoluxob.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fff20e2c6ba0e57f649e1c999d5b1902/waxirizowidapes.pdf
    • https://reitinguok.lt/userfiles/file/sopiforaxegujiwinosofiz.pdf
    • http://tycoonmedical.com/userfiles/file/42464234765.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1ff12eb896ceb339357bfa7fca7552f9/fuzumudo.pdf
    • https://aspirans.com/files/file/boverukinokoragigodogeluz.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093c531abbfc---45251641137.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82542032964.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/66563f5e3c8f7125ce3d34d2330af167/lagirunudobejolaxexuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+many+characters+are+in+smash+bros+brawl
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171e0.bin
16df7784dc8fcc346cb8d1376f74cfefac53f3c1d790b3aa49256f4b0e9977d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171E0 19468 bytes
font_01_sfnt_off0001a361.bin
93736918bc2a95b775f4c5b3041cad73771332b66c8e71cb7f0277b2b82addaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A361 10828 bytes
font_02_sfnt_off0001bc31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC31 16792 bytes
font_03_sfnt_off0001d43e.bin
3c39d46ca31e85dd45a0b007719f7394c54497732b3b13d1241d00dc7e8d6b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D43E 8224 bytes

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