Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f62bec725a731c…

MALICIOUS

PDF

98.1 KB Created: 2021-09-02 12:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13f963466315046b57b43c8136ee5756 SHA-1: c0c5a7de1969344fe0482deffcfcc11bd1658324 SHA-256: 81f62bec725a731c750631d7ef1054f62716ca303bd2af727f771740a71dbf56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ranaghatpchsschool.org/userfiles/file/wodazexixomudatigiferaxag.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2sj8teamikmkr4q354j467687u/zavapi.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/60740999973.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210719011917.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1160b678599a7f4f02eaee1e7c451b6a/77155468014.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9907c3d02e7c21ac228b17ec0c4d8f4a/tixanu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085597671b60---boziv.pdfIn PDF document text
    • http://qca.ch/userfiles/file/dolafijupipema.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/42592131826.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5adaf837f47fdf2a1c24b1ddedff6e70/zimenofaguxejumaguvux.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/pirogurumu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/poxogunibetivukigog.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/17610721569.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b07c3f23891d019224924e15b09ba7ec/bovosufibu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/19393751875.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/faoqfg16p2iu4m2iacm4utdip3/2741018610.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/modedu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd00bdbc00---tirozurilaxalinodirev.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/voranedegojokaxuvoxasofim.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/sagisamumiputagabisojik.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/53600822814.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/gejofitiduniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=1000+palabras+en+ingles+traducidas+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_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 20168 bytes
SHA-256: 6de08f7148b257ee175b1fcf75556e049c9a6b098d4db3701d231ffe9efa1545
font_01_sfnt_off00014939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16150 10992 bytes
SHA-256: 63c6a9c267851b82060f2b747281a8a12cb98ca982682974eff03a3d4d467418

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