Malicious PDF — malware analysis report

Static analysis result for SHA-256 43518679b1b3d48d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-27 02:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd501ae751b6e09cd5cfe62175443f46 SHA-1: 840eb9356b9e6c6b9c5b8f669529c5646d25f45b SHA-256: 43518679b1b3d48db052d018c5d5dd3a266461cb6ffc40d94e46b5cd18ab4089
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bsp-oblspl.org/ckfinder/userfiles/files/9840238646.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb5c5716e5---burofiva.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/84833888259.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/derizemosus.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/39715218517.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/xefajufitofizanewagixi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf5eba0f66831c1b0df0428cbdce6c0f/27471515404.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/pavipelepetizonolupulax.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xagonifo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gadegenikap.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/nusupaxifimafudutepidu.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jalefumagevofujovuvog.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/zatugulawupide.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614420d699d56---juvanazedekepo.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/15794766159.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/11559709289.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/topojapasomerebol.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/kulamelodetexajederere.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/27002652239.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/jelotabefewamunej.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/gukowemimuvuwowejetoweroz.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/kibavirusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multiple+intelligences+the+theory+in+practice+pdfPDF 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_off0000bd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 19096 bytes
SHA-256: e2b0ca705b7235d85b60e538e4a26cdf0726d0cfda180367b8e84958b766ab5b
font_02_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 11108 bytes
SHA-256: 4e8d79b3c7f71d35eb72e0434c78f890cd5d039a07cae779341b521ef6b47554

Open this report in the interactive analyzer, or submit your own file for analysis.