Malicious PDF — malware analysis report

Static analysis result for SHA-256 4326a559c3057086…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 14:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46ac9ec3a1cbe3bef05478f42e9fe693 SHA-1: 2d9da1d11fcd71a44aa6f3ba900f44b9f2e72ac0 SHA-256: 4326a559c30570865675ed3fa9589bbf2440beb046ea84c66e3b742629948c6f
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised websites and disposable hosting, indicating a malicious workflow. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload or phishing for credentials. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cbcom.fr/ressource/site-image/files/pevirukarefomapajowuwetos.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bb556a977b7b64e4303a0f09d7b78fbc/jilufuvotojibe.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090604024328.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/boruzafigakuzapika.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/wigojokifuzexajotot.pdfIn PDF document text
    • http://qwerty.pl/_data/file/pusesowomoxowamunav.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/48676987672.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59ccf025f---81498304606.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/28673170038.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/gedopotedowujudete.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/kagabosiribufosevemosaxeb.pdfIn PDF document text
    • http://hnspkjx.com/d/files/samig.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/jebofajuj.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/19800471225.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/54884199947.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/58731314265.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/64138760326.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/laferotimunuminefibi.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/pozidined.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/milumavavumi.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/gajawazefupego.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffd0827ff---wiled.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/38205828925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ruthless+launcher+apkPDF 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 18216 bytes
SHA-256: 5bb282161270c59e067fb175af7247b5382ab01a4800c277ac3811ddca261cc2
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10496 bytes
SHA-256: a9e43c76d835b773a8897ae4e3e1ed94449d24edf261e9b59883300de89d5cd1

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