Malicious PDF — malware analysis report

Static analysis result for SHA-256 e366954f57ab577a…

MALICIOUS

PDF

82.7 KB Created: 2021-08-07 06:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c76d4e645d0909aa287c73b1b99581c SHA-1: baeacba266d03f7b5e6903d0d8c484e11bde880e SHA-256: e366954f57ab577aa58f5c481e67dda5cf89853132bcb088967227f244b9629a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various disposable hosting domains, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/26910002522.pdf In PDF document text
    • http://rykatd.com/files/xiligotiratoxu.pdfIn PDF document text
    • http://aplus.to/userfiles/file/zaluzosibejefijupewokija.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6b97e7ae49f6b36f3c789beaa4c3525b/tubiruzozaxan.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/77207890770.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160788275dd66c---redapokope.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/mategizitubamerapuvafa.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f371ea322f325eb5b9a74ec7fe756ecf/94636694058.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9e2b59a0---xawewojivivujuwig.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/8223497812.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/40275137872.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608863bb413b8---87299701058.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zikeluzojeteje.pdfIn PDF document text
    • https://sapporopools.com/contents//files/wukikuxu.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/45945394305.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/62898805800.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/winamuvesorufiw.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodebakazegoboguk.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6d0efeae---pibemagu.pdfIn PDF document text
    • http://adveotec.com/img/file/giludekudijemugusuxe.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/xugubuvizemejiropesafabek.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86891f2455---rogitomikagefibevojuk.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/19826608762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bible+crossword+puzzles+pdfPDF 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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 10688 bytes
SHA-256: 37bdf8cc8c1c3d0e7a5744ee5d6c68826a10481b4b738b4e4cb5c991b1b7fd62
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 18496 bytes
SHA-256: cd1f637b677d9c3b3836c80962b94d18a0dffcbc90db8259c0326d9e5b12b4ac
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1