Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36cc40fc77558ea…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 04:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36f39f0705e0b166b6d341513a23ac13 SHA-1: cb72733357040d71a1d581968b1d4ad5e7411b4b SHA-256: a36cc40fc77558eafd3638582ecac7cbaf9960a9ec076ff8890faba0130135d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/liwogopi.pdf In PDF document text
    • http://katyababash.com/images/uploads/file/rolamimugemuvagutob.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bbd9ef5f---95050985722.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239dcc3482---86063309548.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lqrpqn5llbh0lk9ecjlcgrvin4/desodob.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085870ce75a9---30848701383.pdfIn PDF document text
    • http://lawyergz.net//uploadfile/files/semimipiju.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080179b9fec9---88977359821.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/razusipidu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fb0614ee8---92492449964.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dujavitozadaduve.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/31fdbb8b5907a6afb155c0b43ac74ed0/23614938090.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/4771067583.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/pilepukuzelimakowutok.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd42e3c7---vitovifizi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/penozumanefijev.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210626224303.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/90782762801.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/nonibatoxovomegapumabi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dumulagedujofatutugas.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/12158108684.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade585800e0---49511234266.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/60908558176.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/8685334183.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a781d7b52ff0fb525f67a0f74c26a96d/dujejatal.pdfIn PDF document text
    • http://tfforming.ru/d/files/83773751311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=essay+reference+formatPDF 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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 21000 bytes
SHA-256: b2a445dbbbb8dbef5a0e3b8659948a78a13ecc0f4a1631ed8bd6f5f722e82d70
font_01_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF4 10456 bytes
SHA-256: 3190ae5fd5cf7b6ff31e12de97fc7210ef054716cbd51f8ae9c3ad36c276fe11

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