Malicious PDF — malware analysis report

Static analysis result for SHA-256 86894615b93c6045…

MALICIOUS

PDF

143.7 KB Created: 2021-06-26 05:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de31774b3aedb2080b187fa22dbdecc5 SHA-1: 13f4e50f9d8ae95137d906cfd848729d366cf14e SHA-256: 86894615b93c6045c9d2102f07b275119ee43d655aa559867022b3367da963e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of a link farm pointing to multiple compromised CMS upload locations and disposable hosting further suggests malicious intent, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://oniceh.ru/uplcv?utm_term=i+love+you+lord+today+there+is+none+like+you+lyrics
    • http://automotiveenergy.cz/userfiles/file/bikufozu.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/35d168a024fc0e9262fbb39b7e419c50/finuduxibik.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0df5a476---vunosebatanusuxarazupude.pdf
    • https://hoalavender.net/upload/files/wofoligu.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/nosilerokagovimiduxut.pdf
    • https://retta-bg.com/userfiles/50923714125.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6bd71384---35430651168.pdf
    • http://hum-lucknow.org/test/fckeditor/file/19349174312.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098b74aa6176---fafufuzufoketizi.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/vi4tqjp6ensip35ab9cd5q3049/geveserilujujuwiveve.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c4qlkbbik014895ubj2s69b9m/64397324734.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jubem0df05ohjqj9h279684gi0/27186575793.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090297512cf7---50864503894.pdf
    • https://daquin-ferriere.fr/userfiles/file/dezuta.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kezigukar.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c628f197b75---11876766912.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992224706fb---begokebumobapameru.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/kejamirunozenero.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3053b4863---kiwal.pdf
    • http://studiolauramoschini.it/userfiles/files/rodelulupupij.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff10905965---45533573703.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001752b.bin
1811e6c11a5d8db37bd2eb460c6c2ff025d59ce979781455a2e3e2dc72f52c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1752B 17496 bytes
font_01_sfnt_off0001a31a.bin
0777169f5b991c782a3841a5bc15aa1300fab6e3a3cd8bb617a35f67c4d52a9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A31A 22352 bytes
font_02_sfnt_off0001e5df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5DF 16792 bytes
font_03_sfnt_off0001fdf6.bin
0a8419b6c7778fb5eeb04f49b0dc581c0edeb418ba9f846077c37afba6d4cea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDF6 10788 bytes
font_04_sfnt_off000216cb.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x216CB 16344 bytes