Malicious PDF — malware analysis report

Static analysis result for SHA-256 497391078f28266c…

MALICIOUS

PDF

81.5 KB Created: 2021-08-24 02:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a62e90344ee0b9ae799cbdfec8533197 SHA-1: f28bf9e2316624a9fc11da3772cc4306895899fe SHA-256: 497391078f28266c9a31c36ba9ddc3646dd8442857998e43955deb3360a9f323
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary attack pattern involves luring users through these links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://bscsaoner.in/ckfinder/userfiles/files/dabidokizenebabakegeze.pdf In PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/gizapikorubi.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/waxeresuzeloxugivojoxubu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4bd5faeeed9b1f8480ae2ae5b6a95f55/46022895695.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/xavunabawigonububanujezux.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb03705f58---19790026493.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/20b41f2713eadb9913f19989a2898bb9/porirutotolamabagatak.pdfIn PDF document text
    • http://alltechsro.cz/files/89372044613.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f0e2hrh3os969hu3e07c3jtgq2/36092639966.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/44607840430.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///90562492884.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/tilalenowataze.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tofataw.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fcc262b6f949bd5ca538df070649923f/gelovila.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/524ce9356adf1c7b5121538e46a59e99/57256705090.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608875a247fec---sejaka.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/japepoxijufusom.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f74e8f7aebe---jopiwikakunajobogufemata.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/76465889637.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/xevev.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/jaxuwiguxul.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ecdfb6d0e---29441110416.pdfIn PDF document text
    • https://udruga-invalida.hr/files/banojusunujamurozave.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e22fedcf2---52206085436.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/91006648876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cost+in+englishPDF 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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16948 bytes
SHA-256: 11fa748eb6d376998aab95cf9f3e53be009b922aa35ce47451051b9a5942bbab
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 10156 bytes
SHA-256: 2ba42b7b5ec50194bae6fb6737500ce356f9264b4bdf95b630d1e9bf2f14cf3d
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1