Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88a91a7379a3d3c…

MALICIOUS

PDF

82.3 KB Created: 2021-10-10 22:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 733047736e74e5afbc4e011f8f8fa3cb SHA-1: 23f5b1fe610062bede7be0966d1b639dc3176e1c SHA-256: e88a91a7379a3d3ca82194d48c0a4886aa427e83c9aaf6f7d568959ecdcaf88c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161618bf8c4b00---40665333615.pdf In PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/jababevanamelobageres.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/88634969897.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/latapoki.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe01db264a---vonagepuzupegamisiw.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/lifidikamofirosapikelane.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/39978206671.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fokibus.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/67940891564.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/256736895.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/26198839755.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/zepuripevadusixizafigiwa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/011cj8vd09clajgoo0i7pueip1/simidedujevesujolibepifuf.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/79654529551.pdfIn PDF document text
    • https://togeltop.net/contents/files/zupiwexuturize.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/85646977961.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/zekikupezuvefajifunaxow.pdfIn PDF document text
    • http://snsi.jp/image/news_file/wegoleneleziluwozikugeg.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/pokejadovefotof.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/resax.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160e82a3cea5---febufovamokixasosu.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/mofebotapujapekuxa.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/90008906619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+san+andreas+highly+compressed+free+download+for+pcPDF 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_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 18000 bytes
SHA-256: ca85bed7f1b18b740f6d57c968effeb329e40ef5593df30cf54638c4077c4dd5
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 11304 bytes
SHA-256: 945b4c0964d6d4c35890cd1b34dc2658fca47668f3a190b799e50b47af59466a
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1