Malicious PDF — malware analysis report

Static analysis result for SHA-256 5393105a3eb30b24…

MALICIOUS

PDF

69.3 KB Created: 2021-09-05 02:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa14a0b9ab8b97525427a125698e6935 SHA-1: c1de877793910508eb2316786382f9dffc92116b SHA-256: 5393105a3eb30b248be29bbad7de6e4549d3fb83710f0b256f91c8b43529e3dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of multiple external URIs, some pointing to compromised CMS upload directories, indicates a likely attempt to distribute further malware or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7a71f245cf7ece5c7c8ff1bee2db11e2/14812600977.pdf In PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/fugojujonu.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/65030957424.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/62327068280.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/76713788416.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/57041779596.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/50056512723.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/majosotete.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/78721942304.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7ea1254712a5ce9545857303727fe75a/latoruwakojodofukeg.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3de8a0db---39194567030.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3u1pilsejua9g4d854nde7ac01/46325442098.pdfIn PDF document text
    • http://falerisztika.hu/tmp/lexigapediminumifavimise.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/17059997954.pdfIn PDF document text
    • http://banquat.com/userfiles/files/96832097856.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/qs0l4mvd2a8jgai9ds51ip820p/24534791545.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/gotegopezabipoxubek.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/38229505093.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/35138057271.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tcbm4te45gd7pt78k2d9pge8gq/23705936854.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4949813863---59485838246.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vosujijeso.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210821_A07B9B73CD8888AF.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/65725939190.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8e67032d19cb6016ec56405e05195105/luzopisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+tamil+movie+scripts+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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 14740 bytes
SHA-256: 3ab07f2fa62e891bf7665d946744af254dff73d7214cdab56f30b83b3566eaee
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 10720 bytes
SHA-256: 3150c39b6ede4de91136b698a45a8365f7340313445d3b38baf18d9ab2fb1455