Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2b38e09d9bd5f7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11100c318c3d41cbf9cbd3f26b9a96bb SHA-1: 47e261d2c6c22348cb3e3abf1221df7a57161e70 SHA-256: 3c2b38e09d9bd5f70612d49f9cf181429744cbeac95b896e078d2d9d3a6f0988
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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://wastran.ru/uplcv?utm_term=super+wings+coloring+pages+pdf PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bc030b156---33580142346.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81559595441.pdfIn PDF document text
    • http://cecev.com/stockages/files/79887603057.pdfIn PDF document text
    • http://mega.kz/media/upload/files/53909990762.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/peluvawomafu.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/risugetubusujirotogenab.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fc11752e600808d2b80a1f292846fb5a/21353767181.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/92086967434.pdfIn PDF document text
    • https://aedwea.com/upload/foto/zitov.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/670864867.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k81d1thrne1k4tl49l3qgm33d7/pisexuzevukexifut.pdfIn PDF document text
    • http://asvpp.fr/pdf/felukeloz.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/27hnunvccm27oumh0hnq2u8f54/pebepepegomiduxu.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/walomudewemowatu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f89f4858d85c28673e9d6f823ce718db/90260049330.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/56420737972.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/83753695091.pdfIn PDF document text
    • http://arslanemlak.come/file/83641788824.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6a8a8eef005a104b915e64e57f64f4e/nulebukorevevojuxazu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6c3c149bd3f11558bd14548afcb29a49/48182631274.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/wogefodefomosadudikebede.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/lozesepoxikinabalid.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210703/file/16252991193342.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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 10960 bytes
SHA-256: 19385ce4173d7d2a672e1b3f35d3207ede36501bf2de6aea02d5dd0344c07d0e
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 17604 bytes
SHA-256: 255071bdfbedfc43065389cbf4a46cf9f7b91111e0840dabc56d08ce7d74e7b4
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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