Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2b060d1207ce0e…

MALICIOUS

PDF

93.2 KB Created: 2021-09-16 22:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81146c18aa56acb8397d791c4081a3fc SHA-1: 304fbb10882407fa8b960cc3e31ea51f69ef810a SHA-256: eb2b060d1207ce0e47620cc397faeb0e7c33cf5cc45952660e4fd304623b38d5
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL analysis point towards a malicious document used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://greenbins.ca/ckfinder/userfiles/files/92098993148.pdf In PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/41247856491.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nikoralimas.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/805301564.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/vekirivom.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021952520.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/61435006706.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/zigatav.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/91442721566.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/boviposef.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/35375977386.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/16831464625.pdfIn PDF document text
    • http://wmsone.com/eimages/file/pofavogemu.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/29113604275.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/foworupujuzetok.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/wogafogavulu.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/73827104143.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/finekagegekoliranatekaku.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e11c726316---37957893669.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74a1b2920---18130620079.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d91bcb01---16749051621.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/77648116537.pdfIn PDF document text
    • http://asqcert.net/files/files/36881022542.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25131338729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+west+wing+123moviesPDF 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_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10704 bytes
SHA-256: 83ead0cefebffbb5c458bc9e51827b4df12214d70cbd2f2b3d6fb177d65bee73
font_01_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 20148 bytes
SHA-256: 1b05168c0f3b43d6381530655a5120eb3f3e045e03aea72a85f9ce9f942f770e

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