Malicious PDF — malware analysis report

Static analysis result for SHA-256 04708ec9fb4cf440…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 15:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c6ae4c4afe58394d5b29902e55c6271 SHA-1: e222fa90a6a28f7e317ad4e9b230a53611c103d0 SHA-256: 04708ec9fb4cf440173aaede23f2e4025c0967062d7088bbbeb7b731daea27d5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristics suggest it functions as a link farm, redirecting users through multiple compromised WordPress upload directories and disposable hosting sites. The ML classifier and ClamAV detection strongly support its classification as malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=pokemon+ruby+mega+evolution+gba+download PDF link annotation
    • http://silverspringabw.com/uploads/files/kabokoxomifamopakirap.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f32dd54d6500d46cfa957e0e12369d27/86803605534.pdfIn PDF document text
    • http://93564497.com/userfiles/nelekezolubas.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161413a21aa465---40995304384.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/tuxibelowatof.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/95210911360.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/ravosozogojulagen.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/84bf2e658348342726522d8121cfde49/fepakemofol.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/75138037493.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ede0b3f4e---20703279370.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/95152423489.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/86992820522.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/22789976292.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/99499969097.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/4267907150.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/buvotunilowisasopebido.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/74471852185.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/zisoduwifijuruzafeg.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/xenakazuluvirudob.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/78380303480.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18e8616f3---bonisemuwu.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/noliragezutugewokodoviv.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8de8a9fed---pewitupurajipam.pdfPDF link annotation
    • https://equalitas.es/userfiles/file/mamidamudimelij.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kabafuv.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/xapim.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/31761018466.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/vatizodesapulekevidiwad.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_off0000bc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 11024 bytes
SHA-256: 69b114777c274e9dd2af0218ea06fd36e5a117b87de40db41569f22bac06db2c
font_02_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16104 bytes
SHA-256: 225477e479e6b51d476231cb33fe0231329fabf88e26894b2e0f5ef4c2e02449

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