Malicious PDF — malware analysis report

Static analysis result for SHA-256 7821e2617ca6dafa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 18:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f25c2d9b5c5827f449b035d288b760d4 SHA-1: edea502269988398b97ff376de9893d2129b6032 SHA-256: 7821e2617ca6dafa29944c7cf19449fa8cc605794a9794c3511c13fe69db9dff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://agrocare.ro/ckfinder/userfiles/files/jesijatopemanesemuwe.pdf In PDF document text
    • http://z-sinpro.com/upload/files/15048402139.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16142e1f566d0a---nerat.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/99571525459.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/26031650998.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/11604959308.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/99939837051.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/46218291814.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/vabinolipi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/68643566676.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/70672605727.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/37629592333.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///55904605396.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/95205297221.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819cd62c0b---fovavimigu.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/sobibopipubos.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/zaruvuzoxe.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60646323977.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/tuxifiwatowolavumorigap.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e63d054e---pelonebopokevuluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=game+attack+on+titan+android+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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 10580 bytes
SHA-256: a743a73080510a0c9074a28d3f0023da68d1a1699ed2c0d126fb84c25d341e64
font_02_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 19136 bytes
SHA-256: 73153eaba3f5c71ccd292a6e68e30d4e4a424d8fbfd44955455d4de07b51f65c