Malicious PDF — malware analysis report

Static analysis result for SHA-256 9889eb4b7c195499…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 23:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f07e43b8194e25aba29b136ddab51602 SHA-1: 815c6231f09d7540e7e6c0287e1682e88d24341b SHA-256: 9889eb4b7c19549972c5d01af54073cd129fb880fbf1bf9b2853c356d9967ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple disposable hosts and compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and a link farm indicates a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=best+mp3+merger+app+for+android PDF link annotation
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d6ef08e3---javupewosazulunagejili.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/vatam.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/boviweliweferimagewu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/konuso.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/witinidelepufex.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/86732038870.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/xuzubiwokexorexisive.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/95796884744.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/57e47f9df3f2957cf224aed93b678647/menikawotoleritowinozib.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/94467926361.pdfIn PDF document text
    • http://sinostandards.net/upload/files/pixid.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/ropesiru.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2129666366612f6dc37a5cc.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/sekuxidotokar.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/bigimexadovogezuzapor.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d14d8e2e5c---60400733537.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109150446511150.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/88796821099.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/savif.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/varipawaja.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jikipewusuzamudon.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zuwezuset.pdfIn PDF document text
    • http://unseretochter.ch/images/file/43109154786.pdfIn PDF document text
    • http://yanartextil.com/firma/files/74333834728.pdfIn PDF document text
    • http://119pump.net/d/files/85463664452.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/69960096835.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368b5aa0a74---63695476297.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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 11020 bytes
SHA-256: ba9b3216a9722776aba0e2c0c4fcd39763ff34b4ea0caad10608f3f5a4b6c1ed
font_02_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 14676 bytes
SHA-256: 27ecc98740cd6abb1dbc255ad872c9d9f3d4c243b95b93f2538a697b0f00e59b

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