Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b048c29e79134c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 05:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 044b9c729dabbfd15da3f0afc3cd712c SHA-1: 917074f1c7358aa6ed270a08eadcace88bd0d636 SHA-256: a6b048c29e79134cc192ea0ba98f7ef84f00285c114cd0a9e9051f7bb595d944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting a lure for an 'earning app', points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://securitydm.rs/slicice/file/setudevifawamez.pdf In PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/90622326192.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109132121498238.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/67476745003.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zasasaxotitudix.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/91790422021.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/76e2ff35fe229133edda5a01c5c21c53/56073123125.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/78831285911.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210917_1CC19D6D99330203.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jopapenupej.pdfIn PDF document text
    • http://geodez.com/pliki/file/reragodetilili.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2ff2f616---merogumomezazo.pdfIn PDF document text
    • https://birotex.rs/images/files/jajak.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/6800602382.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/wisujabakejudatirepivev.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/javumawadapivuxubaj.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/fojoxejadaboxe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09c2838a5---97748302984.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/93467610595.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614008cc4874e---zabilopugi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/senexefajogajejobid.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/koruvavapasuliburipiv.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/34080956304.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/2703541252.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///pamanevijumadibaziwovo.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/lejuxadixopube.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xumenowuzefub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=matsya+earning+app+apk+downloadPDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 10852 bytes
SHA-256: cf7ed6f98e7217eb9e32af582bebcab23138ac0129dd9ccc57d6fd91c2ad33ea
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 17476 bytes
SHA-256: 9a6de11145311d9b88c42fd35a6425a8210ffe9fd5ce81cace8d680ed4bca93d
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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