Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52dcde13c981787…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 07:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e867502c8179022360eabd0af8f1f3c8 SHA-1: 964f1cc54eefa9227b6c6f905caff3b4bdeef55b SHA-256: e52dcde13c9817870a369f9153b7b5e45cefcbc6d3ebde63591249c730b6346a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://medvor.ru/uplcv?utm_term=factoring+quadratic+equations+when+a+is+1+worksheet PDF link annotation
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/651db2d3d5ef252dd0d1b5b6806f2edf/gegiresajufim.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722036d7ea5---dajeralixidavufu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/58620030000.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5efe70fc9b---82922158060.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/50855198494.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/69003656001.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/jixuvapitijalozerud.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/duxegegamok.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/junaxibatipigifupumixeje.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/52254825752.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/jopitizajabanowarepena.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f03d31389c7---15206736892.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef767f3655---80225294402.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/pasevarinijibodozomebi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6032d4fbbc---43589754453.pdfIn PDF document text
    • https://pmms-online.com/assets/file/31012447195.pdfIn PDF document text
    • http://primaneighbors.com/userimages/sametekefebajemafe.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/rufafaz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5212ab86513e94af4d3641135c9de797/39057149240.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/76010169376.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/32327934009.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/75abcaaf1c4a39eba936594947b3063a/kosubaziforokomanixedu.pdfIn PDF document text
    • 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_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 11056 bytes
SHA-256: 15b0bd317d11da956288d91786ff8e5b60b16e374bbb7483cd7a99bc0908bbac
font_02_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 17724 bytes
SHA-256: b812952b1fb064d19a5561b7d54cdf277cfe8f94a4755c91820514f286ef4f93

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