Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88d33dc4cd4520c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-20 09:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b6108170d3e18007830e5e10ffe5d2c SHA-1: 21938c3eee11c42866f20b0faccefe20fb78f875 SHA-256: e88d33dc4cd4520cf2e5dffa9c9ed959fb5898ba9013c8df2af42007b9d705f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://ambulatorioveterinariocamali.com/userfiles/files/worutujudodivek.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599b534662---xobidalikofi.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/puzakotoj.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e94500fc70db243a56db253f2a2f5b86/dojane.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xatorex.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbcb02e5a---22092271952.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d3e759fde62198590b762dc8b70f7df2/mifoxetenur.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071938e526b7---xenepinazagores.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/gikivovugipopom.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07200bbd8b---19517702791.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/pedupoxekisisedogasab.pdfIn PDF document text
    • http://henca.com/files/details/file/47877933616.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fufccuensisgcmbuntn9vcisb5/wajazadakafuxu.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/kapipaxap.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/karil.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolawinaxumolala.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/45472825593.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/98924746683.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02465e0b76---fogusuzupoxatukodizowevo.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/xukejokudodalifukator.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/cc21e7cc3163920a827b10eff74e6023/revutidale.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/tilifubokubiwibinabozodad.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/bezuzojulenag.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/56558720445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=murda+feat+ezhel+aya+mp3+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 10912 bytes
SHA-256: f6378e5d6e0664c48e68edebdc768c77bd3e6762bfe0d7240f7497ce158b278b
font_01_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 19036 bytes
SHA-256: 1f4a1adfc643e651ec1cd1d8c620e8ed81236d236aadf8ff14ba360d7e3165e4
font_02_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16924 bytes
SHA-256: 478245a40aadd79eda4bc3c70fc6d52e3ccf406607ec38a659cfc8515ec812b5
font_03_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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