Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b239634cbe39a…

MALICIOUS

PDF

90.1 KB Created: 2021-08-21 22:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f82ef2f7ac68933854a01720218b6fa SHA-1: 105f2a1fc6142dd8719611d6fced9f7aa8d1eb9a SHA-256: 834b239634cbe39a2cabb308f2e8d18b2e50fc6e97f0c887f4f0049b8dc29384
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute malicious payloads. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, indicating a potential phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://iccarrentals.com/files/file/70921669653.pdf In PDF document text
    • https://maggies-handmade.com/UserFiles/files/23380324906.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fea2224af---4103140531.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7k5uvnnti61k2jmq7bjs3ddb4k/54486112040.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/kesegomixola.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/gelar.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a149716527ff8a5a2981928ec9d3ee01/tamononezijoxana.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/87642522891.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e8460668cc33550933f4dfb34b55705d/45037937549.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0861f69f997370a07e9b57896676dd1b/95508333726.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad98cb8309---lububez.pdfIn PDF document text
    • https://miet.hu/kepek/woduwubukutizakudunam.pdfIn PDF document text
    • https://computerzone.pk/file/dopazezozebugusokexal.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/16457468942.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/16937009351.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/55504049657.pdfIn PDF document text
    • https://qqhanoman.com/contents/files/fodewozetajep.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/nigivoxumidevunore.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vunafidegepopijo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/90911152369.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dezikobas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lm5d28i3if92lnp3r8i8u0gvmj/zuvoziwubal.pdfIn PDF document text
    • https://norservis.info/files/files/74155705537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lords+mobile+redeem+codes+redditPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/gavipozekujumuput.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 10364 bytes
SHA-256: 439a0fb18de1ed2782e5fe9710b8d7eada025f00b79e5a5209b444cbc7ae9979
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 17904 bytes
SHA-256: 7731b6395d7faf749b3a2c44ec588d076842386d9671f3bd2236b8df3a754ce4
font_03_sfnt_off0001413b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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