Malicious PDF — malware analysis report

Static analysis result for SHA-256 43924f6dd4e094b5…

MALICIOUS

PDF

93.9 KB Created: 2021-07-14 07:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b12f7e441fdfbf967014654444c3b20 SHA-1: 30d5b576a011625ec75837778396b160b0e08ce8 SHA-256: 43924f6dd4e094b5d1d09b08c5b09fbe7b470e94ed4075bbb2d98cfc8ff13033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.992946 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=central+idea+of+poem+stopping+by+woods+on+a+snowy+evening PDF link annotation
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4e20cf926069d60878b9104ebd7ac557/lobelusiweziz.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1d25c665de829f3ae67958a344a94baa/rinakojevuzamo.pdfIn PDF document text
    • http://intergeored.com/upload/File/6335464228.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/m3mhde1nmu0evlqvh44r60q4ko/67736710955.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/mozedaji.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/93914276930.pdfIn PDF document text
    • http://a1-recruitment.fr/v2011/Files/fck_upload/file/nekoko.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210624224812730.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/42943829735.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608143d4ae60a---revixodunuwikuxove.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bapidokove.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///83950175828.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/vuvev.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389a8e0595---59439728122.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/wurekepikotajaxowuvawob.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e088280cc9b58b5342017417406f8857/feridulodabutisi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6702c5fba9430d078541fda39dca4ec1/revolugamabosozufesewixu.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4e769f63c53336ff9eece59ede166502/87376462282.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d67032bfb06c2ae1c9dfbc526cefdb76/43676351218.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/27383657430.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hl6gm987t504596bfgshiskun7/11928762947.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/42608337789.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f71de756---42639726477.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e8365dab---zawiwepokemofinafima.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/78191220287.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_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 17456 bytes
SHA-256: a90e877aeacb2a2823f5edfb08a1421a8a4a2060b18cbd11a9ac405670aee0b9
font_01_sfnt_off00013775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 11276 bytes
SHA-256: 9bdc4afb794e408900d30975ee86673f1d91fc1cf7b717656db5a4d387d62d33
font_02_sfnt_off00015198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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