Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8390a615928eeaa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 16:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 999dc0cae600150d65db29dddd9faaac SHA-1: b44c590af49adce9b3ba8cb5926d03dc03da6cd1 SHA-256: f8390a615928eeaa21667d2e99f580dd2b57fb25db37d11380ab7effbc5f4e41
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=how+to+install+android+on+nokia+n8 PDF link annotation
    • http://kientrucnhacuagio.com/upload/files/rizinofumuxo.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/pelanesizewemuxab.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/36327553664.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/3766180360.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b63ef0bd2e---kemelomakimemasekowowedaf.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c9f4764bd---vojugoxarurul.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/xikirud.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/88925642227.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/80927385987.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/92864774295.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7c9be7f---jutaledunutametisiju.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/49383559439.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/jonuvepigonaveradu.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/wefudukuzobase.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/naxenani.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/73848221107.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e1e94e0---bofexurupa.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/81856405818.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/88261997966.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/77025788199.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/99395973192.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50933386027.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210918_C3431896E570B4C1.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/9595578941.pdfIn PDF document text
    • https://edusfera.pl/upload/file/138102139.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/lagisipodafedun.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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 10484 bytes
SHA-256: 3c36be46d385baa2db234e3c44236f6aa61e02e036c4cc7dc4a65acd1aeb75c3
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 17976 bytes
SHA-256: 4027d8df4b4df55003df07740c99b651fbc7f2f3196557a481743f110e7e89c9
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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