Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3a568944fd91b6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 00:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98874ab70442fa539611750b6d160b98 SHA-1: ddc2afbee6eb26e50e4acd66e6e04d8d00b07336 SHA-256: 8c3a568944fd91b696f539d475346eb8b68b38423b4102f7725ee8d09baab8f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are hosted on disposable domains or compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148274a03c12---felofegefenabofiwu.pdf In PDF document text
    • http://7sate.com/filespath/files/20210912201613.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/82574525403.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c343bdb263602f43f97078d289e37b8b/94172376106.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/51797002596.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/sofupebazesilalexevosatep.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///falowizevebamerudolase.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/dekubefimodokomosan.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/pabatotinuleduvaduweb.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/35878783935.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/23641847757.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/15493771362.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/wezija.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/35d12dcd41a4b882270db15594d748b4/2999542331.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/92060216507.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/79565387858.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/13057061847.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tepufegepibafabetov.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fuxawezorajiboxugos.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/91213669021.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f673726df---dowogabutikijefanerezit.pdfIn PDF document text
    • https://techlan.pl/files/file/kakigekufanodureselikono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dt36+smart+watch+price+in+bangladeshPDF 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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 17740 bytes
SHA-256: ecfd478a3cfde30fd72c3c57782d1d09ab201a61cf32210ad400973e75ce9680
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 11408 bytes
SHA-256: 3bdb95ac418e0c8cd1b84ececb128f1d842f6f9fd3fdd57304eb0a22c5a084f6
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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