Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cc64e3da27e6a7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 01:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3bad01df507007b7a224bec428a1dbc SHA-1: 7d6914943b2a863261ee241a79fe63f09e475b91 SHA-256: 44cc64e3da27e6a7f1a79797053cbddd915a1700a58adb7ede2e533d2fcd5f39
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, some of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://nslogisticservice.com/userfiles/files/lafopejurenikumiru.pdf In PDF document text
    • https://euro-m.si/web/dokumenti/file/murisudone.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/16418837618.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/90315876971.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/wowovimapinakatipi.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/84108760953.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399ac14eea9---mugatixugigobonelajowexos.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/lojofifazenaka.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/70634931.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/r3mb32u685g44999h2plsufs36/zitojunerivumedujebosez.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630859584.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/tomusobixuzema.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/27256838108.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/kejejetuxebuzizizebed.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/85799436005.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/16572107403.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136370465839---segazusu.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/nekodemitilisokawunileso.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/gijunuxoz.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/14169864864.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ab10ca8adba0c85492b25ba2f8db42e9/xuzik.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/zuxosugi.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/dodikino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+5+mod+obbPDF 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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10080 bytes
SHA-256: c5c17b3a7ad97d3481133d8102a776f36128bbf5af239b5be360bb92865ae36c
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 18192 bytes
SHA-256: 2e6bca22c14a3206dbf1b730477ea128ba31e74362a040fae82da250f57d8095

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