Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1b3d22216924c9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 03:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef75c7cc365bc079c32ee7930fd06ed4 SHA-1: ee514dfad2d2aa8cb4d20aca30ac65b7370d3ffb SHA-256: 7f1b3d22216924c95d4782085e6f3a275f08bbd8ed90640c0660997d22be91ae
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm strategy is commonly used for phishing or distributing secondary malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2eaaa5af---salag.pdf In PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/nixokimuwududukoso.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/53945567978.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b83c38d56b41e832c64babe056357e43/wamigokoxazuxafolirin.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/38302867870.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/83041579433.pdfIn PDF document text
    • http://robbes.nl/media/files/wupububugabekevenobapivu.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/kategaguki.pdfIn PDF document text
    • https://fobh.net/userfiles/files/jigerupidigevolumeg.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///45293803014.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/nuxejitureletopaxelibib.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/sugerekuxakuv.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/jexilominuzazalew.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/35137739948.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/zezunixum.pdfIn PDF document text
    • https://signika.pl/Upload/file/fotapeginuxopigefezini.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/95097243585.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/53190819652.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/16142918803.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jurizugop.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ad9668cb---lejepidefupivajoxaga.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/39773404515.pdfIn PDF document text
    • http://freeorden.com/media/file/dixobuxejulirodalutewa.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/soxipofotazoxajonepavavok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+weathering+magazine+free+downloadPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 18960 bytes
SHA-256: 5bac6c420d1b0c4db1c3f37a949b4cb886c8ae96a4817fae1fc2f76a068fcb47
font_01_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 10744 bytes
SHA-256: 539098642d9c0c1ee05e3ac98f5e0628e4a4a9c8984cddf9511d887518fc6dd8
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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