Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8d2db64dee9753…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 19:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71074c090a89672954c2ca2dd92e9b34 SHA-1: 8a750f9758ce4f9a57e39813e71bd76ac8241440 SHA-256: ea8d2db64dee975324e74a24326ede251a5178410c6c0b86e17da75e4f2c776b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download pages. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 http://phdpecs.hu/userfiles/files/pixijuvalazotuniva.pdf In PDF document text
    • http://stefanourso.com/public/userfiles/file/1247323999.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/ginoje.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a49e171f3---47680306369.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/jorunisam.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607729a0d0b40---86764979461.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9370ff50---5781486612.pdfIn PDF document text
    • http://robertbah.si/files/file/42158599127.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210619061030_yoph4z.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a6f55a931fb999bed8071e8b2c432c86/58376063119.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/7999699010.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/potiwozop.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3067cd86---vuvaf.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/68457566080.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/2462794486.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc93fd04991---jotifelaxox.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/21715977252.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/40866669643.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/tipoz.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/75855786369.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/mapanerexirezidi.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/ratavape.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/74034234751.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sikawegekixaz.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/41960753124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+hidden+life+of+trees+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ba85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA85 18592 bytes
SHA-256: c32c792ee2bfe14cd290d3d1768ee646c810f3e6e9a328503813bb5ff75e16d0
font_01_sfnt_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10644 bytes
SHA-256: 1d6c5884ed664672528eb0a139a32a8ce6c4999b7827be6521c0f25652cafffb
font_03_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 18100 bytes
SHA-256: 92340bf5abb67766a4bd70a417bc496db91bc4518b4d31e12c5a9b671ce20b5b

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