Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fc2d79f878b17f…

MALICIOUS

PDF

129.6 KB Created: 2021-09-03 07:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac27cb5950e166b60996c39312c716c3 SHA-1: 36d62c1973355946591320de08d8247fe3f84cb9 SHA-256: 03fc2d79f878b17f9bb318a6450e9aa39ad21cb6facfc4572c738037858cd894
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for distributing malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161013200487e9---zidavapined.pdf In PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/2206785172.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/bimuvu.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xuzawenogatinaleru.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/7776065318.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/godekobedenevape.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kejirokefevawivi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd0e134bbb---tejozerukarajixebikije.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ffe0e42---xolonogukazurawifugiruf.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pavimumumu.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/lanusokoruvewexuvez.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e82ca550775---gegimonijezokezuden.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fba20f113dfaf2b7e47441773a61b912/rilozepi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce13c51a9---gelatukirerusuwagedagav.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d60eea85d05d0767a2836690af42faff/xajotulotite.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/81543922253.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f6b0b886---gabulopexenafifal.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/8418807841.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/28604965011.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/otj5bk057p9eftr821ahko09ep/pekugaromotimebanipebol.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275adceda87---799223355.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/wapulugivowazarusetevosas.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/52349585378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=revista+proceso+pdf+mayo+2019PDF 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_off00018e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E80 21176 bytes
SHA-256: 9bcd62a3a64952d8be3e2743f42077685341a0b154ce55eeefe0f1df36952a57
font_01_sfnt_off0001c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCA1 11316 bytes
SHA-256: 73ae53556e1e9a2642ba520280626cc1e49b9350fee3cc8a9dcdb293ade98877

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