Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb546941704f9d1…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 07:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2bae0e2d12bf5a18eceb2a2118ab9a9a SHA-1: c34b92f02e0256201da43ee385912caf12d7306a SHA-256: efb546941704f9d1241d84fa3018b1cb02689f85f3c2e41ff8c003098c1797ae
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. The document also features a large number of external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=mastizaade+watch+online+movies PDF link annotation
    • https://thisissati.com/userfiles/files/nidejemodadokipopisaf.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/35173974636.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/80260680206.pdfIn PDF document text
    • https://parfumzone.ro/files/file/84577424054.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/jidiloridunewedeze.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/pidenudesikafuf.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fe466ce1b18a524496ec46460777aece/jiminaporafeli.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/gedodolijop.pdfIn PDF document text
    • http://stisk.com/file/bobobetenuseloluvofedepij.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/20539464744.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/mivigu.pdfIn PDF document text
    • http://js-space.de/userfiles/file/35924628540.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cf8e98sasfl86cvivnokhabt34/nepozolawupatisuwoz.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/85153543744.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/45618168649.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/zowewaw.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kelawalojewuwaxewaledu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5a9fced0bd497b0620b3d7fc693bd93f/lavojelinifaxetifunume.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161329b267e2ea---64318092933.pdfIn PDF document text
    • http://aimic.com/userfiles/file/55344954022.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/bepemotezuda.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614773305c58a---dobogonawawidulusulo.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/65419666092.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/fokurota.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_off0000aef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 10740 bytes
SHA-256: 46b19906bff3340017e9339f7cd7199b780df7b33f196c52f2517087449e56e9
font_02_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 14620 bytes
SHA-256: 02aa8213b41998d4b82b4c50abc02b99d7a2a58d23df040d9efa1d68da68f427

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