Malicious PDF — malware analysis report

Static analysis result for SHA-256 a587e272079e2c89…

MALICIOUS

PDF

72.4 KB Created: 2021-09-22 21:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8adbe39a370f37827a21e193e6ffb71e SHA-1: 056cc350b958c8f9c5671fb951c794ba37779c90 SHA-256: a587e272079e2c8959dd951a24f1c7025bdd6fe1f236227f603517aec86c8728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=live+football+streaming+tv PDF link annotation
    • http://aktifithalat.com/resimlerfiles/muzerarosez.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/45348632264.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/73405806035.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2c37b07d---57501170661.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e2ca5ed6---kijolezolaxibumenepogem.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/rewabajovenibi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/dilawalakodumeluxinewabek.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/goruvigibuvov.pdfIn PDF document text
    • https://tessuno.com/upload/files/6137dbd111cd2.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/77266771741.pdfIn PDF document text
    • http://lactopad.com/uploads/files/deved.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/jokuletefudoselu.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210916170044.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/sosefenil.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/30482926126.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/dezalotagolabog.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/29865431181.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/52944810104.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/50796739007.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/60023501235.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/gidebijevodug.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd4db84a8---zoniligigakizusakelubux.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613129F3F14BD.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/pajojij.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_off0000bb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 10720 bytes
SHA-256: bdfd8068a257554306521fe2bd7d46b402841f890c9bd3dbf0c84f92ab82d531
font_02_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 15596 bytes
SHA-256: f871f2ebabb7f880039ec07e6848e8d022126431ab90163fd14177a2be6e3ca9

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