Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e68fc1ed8369c41…

MALICIOUS

PDF

78.9 KB Created: 2021-09-29 05:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df602174b9ce057b0f9da929d288d804 SHA-1: 6845830f0d7c84bf1a00c84359d6349f2af029d9 SHA-256: 6e68fc1ed8369c41b539386c3cd3d64f1e1fa1c6b685e1d236dfb8ea5e8784c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The presence of a link farm and the 'free pass royale generator' UTM parameter in one URL indicate a lure for users to click through to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zaun-produzent.de/userfiles/file/26533470682.pdf In PDF document text
    • https://cpsguffanti.com/uploads/file/54336686617.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/muzapeg.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/vavadokigotixujet.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210921190226.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/tufatenegowatifukuniwad.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/42491681912.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/52336927675.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/seweg.pdfIn PDF document text
    • http://myphamasia.net/upload/files/96975627860.pdfIn PDF document text
    • https://il-gusto.com/images/file/38080350231.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lawaberik.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/sevofegetepuzurujipaj.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/62037994309.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/wijujeputabedesakuzox.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/xogunun.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/75928941266.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614687f08a0f0---lufanawatiwudoxajoge.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/romiriwanojotumed.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47b5cc986894712122c073f185ced7b4/labarobakedemijajuse.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/87881937421.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/fejasimujipawevojawavaz.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/gigodipidifexe.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/53274185728.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9d57796ef28cf91fa099865e28e6a4d0/duzonimawoxidoxedaxuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+pass+royale+generatorPDF 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_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 20756 bytes
SHA-256: 4c4705f8c168fcc73053e60b509eedd7346433b42de759d4f91ea3fb2625b942
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 10428 bytes
SHA-256: a82b60b8686d041c0f48e4140ad23c15ee2c264b012a781aab2c602c0cb2a143

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