Malicious PDF — malware analysis report

Static analysis result for SHA-256 454ead34f996d0aa…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 09:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 365b4660a126c11c94277500d167bba5 SHA-1: 90b7adca5ec0986e0b22d2f9ba54b89defa17817 SHA-256: 454ead34f996d0aa8723483049ec6ace6c07b8830fdfa092f424fb0ef2fa1eeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=free+unblocked+solitaire PDF link annotation
    • http://lubrifianti-auto.ro/files/file/48089046552.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/39229041444.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c3d8d80---nepivenaririkutizilidir.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/16309386360.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/peguruxatelegugafasopi.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/retuluduxonakumuzejat.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/5333878212.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527845646e---fiwinerurike.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613999c8492c8---zotesopiveko.pdfIn PDF document text
    • http://duef.ru/public/file/72095806292.pdfIn PDF document text
    • http://stisk.com/file/11767060704.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wabizebevaduzek.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/jezenumobawadogut.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/pijugimelog.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/69940045436.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/66526871590.pdfIn PDF document text
    • http://hkalc.com/userfiles/26882629185.pdfIn PDF document text
    • https://digireg.li/upload/gufagenuvemapelegom.pdfIn PDF document text
    • http://rjt1.org/upload/files/numoparamojabit.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/fivakunuwemizeve.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/jebanomi.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/131291093.pdfIn PDF document text
    • http://torgoborud.org/images/file/24630407244.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/zutaxugudosapagojebajep.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_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17864 bytes
SHA-256: 2e547ccd5fe94a65255ad2641ff1fddf66bd7ea513625d0a6e55975480afbadb
font_01_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 10672 bytes
SHA-256: 14d116b745288ab4ae7c7dd3aea34a83d18b72153a4e11e059d5e3e08fc2510e
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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