Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6278dde2ca5413a…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 06:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f63e26c163a4674a6921fc8b1bbbfee SHA-1: ae3071d31a7027a0a2c8d8caaaf0daf17eb60d2c SHA-256: b6278dde2ca5413a098fdd1dd4b78cc52afafc5c3517a576cd5807cd69b716ab
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript and link farm structure are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=how+to+purl+2+together
    • http://haniltm.kr/upfiles/editor/files/43231679612.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lp911oevgge4tlhh90gtknf614/27431183648.pdf
    • http://www.aadhar-interior.com/userfiles/file/62981107532.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/232udsrk74er0umnloimgvud1u/90987219686.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/423b4ff2f084e5094100461da4d77424/runitoxokirisuvak.pdf
    • http://apvn.info/userfiles/file/fubosapuvegojavopibazap.pdf
    • http://garageanything.com/js/upload/files/rijipakufogatupogifatot.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71a159a9b---dezorasiluvip.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3a6874106f69d48bff6c2fe612def0fa/lituvunogiwemoran.pdf
    • http://dissanna.com/temp/fckeditor/file/11554340395.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/17b15264c4bd8e77cb2f0c65d3355546/kezuribugezotafutasabo.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c27425c86781c41b95e051fbd1bf6b3c/mafanag.pdf
    • http://wellfoto.cz/pictures/files/nusigisupefil.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745942ed1c6---pimepijofagexi.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4034026c11---88083798737.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16095714f95752---gijedamatutulolavofonuxum.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/noditub.pdf
    • http://sns-russia.ru/userfiles/file/88831810078.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5f597686---lejituxobisogefu.pdf
    • https://topclassgreenery.nl/images/file/kekixoreniximawusajusa.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d384d6691c---69143557278.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc90450dde0---1504514387.pdf
    • http://promador.pl/userfiles/file/vigisol.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9fc4badb2ec0246f0067339fd314c032/49965055275.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f0.bin
afd3ac0618d2fb042d4d7255e777da9d6a58bffac494a5c93e8d0df87c8dc858
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 17728 bytes
font_01_sfnt_off000115a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
font_02_sfnt_off00012dbe.bin
8ab5f90d257478df81864b765e693c98de5932a513d200bd98686fd22fc32b88
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10304 bytes