Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bf580ab3236446…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 15:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb85af2a64f8db49877ce5c5b984e370 SHA-1: ba48bd26d255fe869b445afdc127c676d8eface8 SHA-256: a8bf580ab32364469e47e593d2fae6b949c0fdd556033c38c526c9a93a5dc3fe
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 link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.rapn.ru/ckfinder/userfiles/files/23398693843.pdf In PDF document text
    • http://richmediahouse.com/admin/uploads/file/jozowokafedokebimebuzame.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/daluzutirilikazi.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/bexorisomekezejenigoripaj.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/54061572758.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gojunila.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613219256b3b1---84341885181.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/57415879348.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/mna98e8rfbtabunot2l1h179v7/24106000740.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/zojitaxowagizalekefilozig.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/94190149855.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/suzem.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/5629218003.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vojebojufuxunenu.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/madefajonotepevaxuro.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/54289575633.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/48679253874.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tirizapavabarepufip.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc1b61f17---minawudated.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59aa659bbdc177e60b765f312632eb6d/bepusiriraxutedif.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307de4afef9---fotagovoravaroz.pdfIn PDF document text
    • https://viceda.com/userfiles/file/41557699246.pdfIn PDF document text
    • http://deforma.it/userfiles/files/gogudomukomositoxaluxa.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/23629184937.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/joluvono.pdfIn PDF document text
    • http://hocomesun.com/upload/pimepiriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dead+target+zombie+cheatsPDF 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_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 10868 bytes
SHA-256: dd094bc69c23ee9ad218743caecf7be232830dc14f27939adb5c19befcfcff3c
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 17076 bytes
SHA-256: 5260efff1c2956d13ce71c03b88be5633515a161862e7db6753257821f501e8a
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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