Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fc02198afee340…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 00:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a1ca7931330a40ccf72e3c7ff777085 SHA-1: 8df6021b7a286cf120d2fcef989d3ffa275e11e8 SHA-256: f3fc02198afee34085a7cd036643738bbe6cc632b2663d1a40f092523d3b8981
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=vox+tv+43ads314m PDF link annotation
    • http://vaynhe.com/upload/files/3641162815.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dtfc43aflqhu29tsf9grer5bgg/94507440541.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8722f4674292e6d61f46cffd22fd79e0/fisewuzurizobolegigagoj.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zozovixolumesepu.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/lurizitunenip.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/bozazoxijo.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/26475409322.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/wumowividi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f184789638---39847245206.pdfIn PDF document text
    • https://tamm.be/_files/file/faromupiba.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/41157950656.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/be7a7e78f15bf701cdf85f13c799e964/tinafetelumumoge.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ab94de915fe3a5b4b5df2f2dd7d4e08/9192230144.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zaferusepugoduwu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/remefawale.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vopavigorizel.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dotumeganaluvopukamote.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614865ed278d1---ganenel.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5b956a20b7d5ee10e96a6188c7eed142/20693492174.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/37827373906.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/vatefepalokopivinawaratun.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/jozexigapakesekalizugevop.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/74225950045.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/luxesaxesubapukositu.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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 10376 bytes
SHA-256: 98d2bbd700db8f0d9db0f3033c207165b2994d01da76c54e27f35e8b049f1eb6
font_01_sfnt_off0000c794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC794 14524 bytes
SHA-256: 40d95d0936217b27312a56f5daa3b3d0da0175591e1beea66f5f0607caa9c2d1
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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