Malicious PDF — malware analysis report

Static analysis result for SHA-256 de70e93bba381014…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 19:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5429e79ed1a1328209cc2b7f72082cb SHA-1: 0711e2e3af7b8756ee809e7b067fb424ba51d136 SHA-256: de70e93bba381014a01c56bc3ff9330f7a3927153575c8ca8007e65c5f63c39d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript, though not directly executable in this PDF context, indicates a potential for more complex malicious behavior if the document were to be rendered in an environment that supports it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • 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://sportschoolindex.nl/images/uploads/86460987176.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/00745ffc52dc622bdcc7e5e882825bff/wexemapepamikosorogapefe.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1ab69c1c---kogubebazevo.pdf
    • http://crescentcarpets.com/userfiles/file/nefavigunixaguturebugopaf.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/93391185039.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4dba82c6---fawebapimake.pdf
    • http://hopkinshigh1961.com/clients/878968/File/36224936852.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4a7a7131---todevotisegukovasime.pdf
    • http://romanakladatelstvi.cz/userfiles/file/suzuxebedokazo.pdf
    • http://grandinhr.eu/images/user/file/pifijefixaloro.pdf
    • http://barudan.hk/UploadFile/file/20210606235338859.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91c7a4214---10084860401.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160800be39839c---bomarabigop.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a62d71af9---99807084201.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h4khs9nd7epj5gk080msurq85b/vubuvotumev.pdf
    • https://baobihungphu.com/media/ftp/file/33321177722.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b2ccfb2c47331979185fcec6ccf3360d/duvugutolo.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/wegikomulenijikofiduk.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42cc7c865---mesakasisafuwasinesiwiz.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7irabusl6dl0qjjatsr4s7uf3b/penipa.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/70625250120.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e070b913e---vadejilezigi.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/esg1352ib9u7d1rt85onb4q9m0/58321393516.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63ee027ea28ee02e551c50db9e0d536b/81153393572.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=glute+exercises+while+sitting+down
    • 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_off0000f8fd.bin
e15e7e1cd1d427648a4f7f84b23be3ebdcb9221b4b38abfa5c4c8e00c010c16c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10816 bytes
font_01_sfnt_off000111c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 16792 bytes
font_02_sfnt_off000129db.bin
08729bb6970b85a489ed3617b457764822c16cbfdf4e81c337812799d04d8e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 16472 bytes