Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba31ee1b472bd4e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 02:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5535383ba00d5d70f9ea254f2475ef93 SHA-1: 339b8b949709584fb9261ed7b63284e9f9e1fc4c SHA-256: 2ba31ee1b472bd4e9415437b8beb2a2f6abcc7a49b2008fc8397928ac2b8d278
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, directing users to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/pukisaperuka.pdf In PDF document text
    • http://market-oborudovanie.ru/upload/file/33403322495.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/lotimazoz.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/vodaba.pdfIn PDF document text
    • http://iviltra.lt/images/files/ninofadozadalazasim.pdfIn PDF document text
    • http://c-amc.com/upload/files/foxogupotijelix.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/wemisinipupu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/061101489415.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/47176351610.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/34966266851.pdfIn PDF document text
    • http://bienbao.org/uploads/files/malepesiwonuredumulinefu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9mncvd809s10h35v89bt4utd9k/magasupebepobutokefolav.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/munofapizemi.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/95108871868.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1c2a875a---pemosebabameluwosuxed.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/52370996434.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/11314002684.pdfIn PDF document text
    • https://novsport.com/content/File/rakexomedulawavaf.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/12094200482.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/jorikiterunigufezojexu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/lonemizozinesuzoru.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/woposusemixidaji.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff744856cc---49667732168.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/85609711945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+call+historyPDF 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_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 14584 bytes
SHA-256: dc5ae89ccf42235bab7d150fedd07353a12885f3ec783a25107c3794b4f19a1e
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10428 bytes
SHA-256: 749c5eb2785910522920af0becc1742f964d272c454c74319b24f0b982a0a4ec
font_02_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.