Malicious PDF — malware analysis report

Static analysis result for SHA-256 23913911868a49a5…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 03:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23eab1e97928628fc41e60a466581adc SHA-1: 743027a5ee57462d6a2e5fa5cb5a82673ca4964d SHA-256: 23913911868a49a503c5e6e66460d67512a737419e4627aaa7454e0dee0d1ea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997b292cf3---navekabewop.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/wesosazipelekoxawiser.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/9a0kr5i39p0u89t4kk3bj5dp97/41434949806.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/557e781c261f5baa0ce7937a5264f543/livakoxenib.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423866915d---46438926658.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/44640726521.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/poturimewupegewumedof.pdfIn PDF document text
    • http://mextro.de/upload/files/85270357087.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607580e6928ef---25057591051.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xekuwegaralunerem.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/surutakolegonunebomu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077405099010---87346109253.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jejolafuvinati.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4tnf6me28kk2pv4ei36ce5avon/ruxotonanifuzi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/88100744659.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/zunisasijuroxa.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/27bd37779a6b83b688a39e58f15c818a/92223079476.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/32f854f28fed6940142930eb17b19a36/muvikokati.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0948fa399fc4c46cb0635bf1f274f045/19897541968.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/gevefojexib.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840af526035---54472950570.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c623dc234f99b22d75c3da40ed6e2487/libozofaligopibulimifu.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/totixexawurifapirufozurar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=group+by+subqueryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 17744 bytes
SHA-256: 321e0980ba1e2d664744ac08287cabb8e0afd51ecf11b912499b1096da492f9f
font_01_sfnt_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 10284 bytes
SHA-256: b9320c3e30122dd7dd55f0d7744a1eb356519158a7ed88e480aab57dbfd9e0b4

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