Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a640fdf26078d1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 10:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 238ad79f7b610d95e9e5d9acd9ca8269 SHA-1: 2b5e0664c2d5a2b59922f27d4c23421040fa2d41 SHA-256: 38a640fdf26078d18ab26b8be6308d8e96ad372470bc12fe2b03e341a0c2cbf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://cl-metalparts.com/d/files/bivokodobotevisokevejowo.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c80f509d411b39b89565729a7f1816d3/62854587525.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6149d9aa---29501178367.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/fiwerawarotapakegukufono.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/39006725971.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1fee98afd---19075108678.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/lexiwa.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/54500034713.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/tugopekixapigi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/97252727002.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/fimenumuwimeligizikur.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///kipilinam.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/visanote.pdfIn PDF document text
    • http://renault-service.com/userfiles/25362548343.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e794102b10---memewazupagexatelo.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/pupumufegibuzolezup.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/7963744256.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/37478869580.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/ganofijumesale.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mgak3jkug51ul7bau2kb8976cm/kivamipokov.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/13eb7fa4b7d4daa84fea4b4ae99dbbd6/maxos.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/buqt09448jqkabcjie9p4cptm1/21878420532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=d%C3%A9riv%C3%A9s+des+fonctions+trigonom%C3%A9triques+pdfPDF 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_off0000b943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 11224 bytes
SHA-256: 4d6e32b06c3dd8ea44c59b8698087ad264bd816cbd8e6fe475a0d878b472a557
font_02_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 18108 bytes
SHA-256: 5dbb12d842292404d4b624de487b0360f319b4508417576367be7fcba170de4a