Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c150fa5543c658…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 13:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d6054aef7a6b942f545b7bf9b6e9b5c SHA-1: 1444d46a3a95da312048553976e7772df3ca467f SHA-256: 35c150fa5543c658df73810a6c0c03fd3d23274a8a530c04bee4a4e7dd4855ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=android+camera+record+video PDF link annotation
    • https://foundryindia.org/userfiles/file/kevinesobason.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/94273321864.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/10358398490.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/23100949678.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/nubovukutuf.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/mojazexujuvizofosuwu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/5061293700.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/guvaget.pdfIn PDF document text
    • http://vaynhe.com/upload/files/83779702631.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/sulinu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/951dbcfa129eaacfa9cdfed8ca1f05f2/41631726277.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/49424045369.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/91447632243.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nutemopifetarifudosuzo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431baa82ca2---87232574119.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/giwudut.pdfIn PDF document text
    • http://indemo.pl/Image/files/22585111439.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/31548060490.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/40690039443.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c65ed3b69e8f7dd1d868b9ad30e802c8/ravifonu.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/tixejokizugatebivufimod.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/jokegikoxaweni.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/41952263408.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gejiberofiwix.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/kasofulegutat.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bazoxojiba.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/dejigenunanuma.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10264 bytes
SHA-256: 3cf944d661a856f7d3f6653d9b2ea871a8217ccc6ce13feb027829fe7f107288
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 16728 bytes
SHA-256: 9f4971683d1973ac28953af7f44a4871e65c11c4403781a1d70409d5a66bf73a

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