Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb752b781b45235…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 06:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 937cac25f4bae32b964bebde09e8fc28 SHA-1: dc896745056be57c34ad373b859aa898461bff98 SHA-256: 3bb752b781b45235b20a8ca29a3265c031d4f6ab459037a27f031eb020cbaa64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://obermeyer-modemarkt.de/upload/file/31375025325.pdf In PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/75322990253.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ef087134---zujoxuwenomuxes.pdfIn PDF document text
    • https://rjpexport.com/files/vonevexatarava.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/giluposagijuzodibof.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/35599106938.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161409142f1e77---tefepujepiv.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/punumiromojufe.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/64385142643.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/vulawuxug.pdfIn PDF document text
    • http://effektfilm.de/files/file/kikapidabafo.pdfIn PDF document text
    • http://sjanzee.nl/file/jojolumutetuwilifaj.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/vejolitom.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/19175709296.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/nanijijemotemu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/25240938434.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/ribemitisegawak.pdfIn PDF document text
    • http://muszempilla.com/files/file/97094193453.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/laq31cdld9pdqq5ktnddbfqbvg/domenafijisatig.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/waxupivaniwi.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/33257003665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=persona+4+golden+all+social+linksPDF 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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 10620 bytes
SHA-256: e9278e25e07d8b0353cd1e0b2f0f1bfaceff8eb78814dfceba9c440dc0f9db89
font_02_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 16072 bytes
SHA-256: 2c510d233d59224a55023cda0ea693ed4159f7b85a97bb7c17b43e161d101183