Malicious PDF — malware analysis report

Static analysis result for SHA-256 9595dffdc8ec7fdf…

MALICIOUS

PDF

125.1 KB Created: 2021-09-29 01:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 110f2414d006021b71f1b9ce36a18c3a SHA-1: 3040c03c839ed8500a04e13625ab5b7b21ab1285 SHA-256: 9595dffdc8ec7fdfd3585db4c7efbef75b0ae2409942dce484d5e3cd601de178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the identified URLs, which are often used in link farm attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jinruily.com/UploadFile/file/20210902044701096.pdf In PDF document text
    • https://worldcastlive.com/userfiles/file/zuvip.pdfIn PDF document text
    • http://17njl.com/userfiles/files/xijelexevokiwuwimako.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/29979388276.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/91858217981.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/93286128993.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/dolerekawujebawivofape.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/64930379902.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/27811442236.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161383ffab6e18---18467527952.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/35879253193.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ba3e4572a388ada95c18e15b53cbe15b/96365498837.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/metolejujadopitapagipolug.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/rasavago.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9742bce4---38903487883.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/sugujise.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/38360277734.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/sisipakaromagibuladeg.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/ramefowezar.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/99489018683.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/magunirujok.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/malar.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/firosepezalozizumelux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pozadine+za+mobilni+telefon+androidPDF 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_off0001838b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838B 19200 bytes
SHA-256: c268259ae17f2b08da2437de3a7c7ccf0b647b3cc1013ac4b808a41acd89cfe2
font_01_sfnt_off0001b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4DA 10548 bytes
SHA-256: c48f6eba5dddaa3f9b28628a210dda7e2bd54f375ca786451afe7a1b3f28b486
font_02_sfnt_off0001cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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