Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5eeecaffb5d191…

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 04:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39b504d2ea09560ed524b4af9910ffa5 SHA-1: d92cc744722bb0ac498ecfa9753660697bf9da8b SHA-256: 5b5eeecaffb5d1917f805e7f79a8eaecc15a6534fdeaebce729ece802fbca6b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ajtoablakcentrum.com/_user/file/daxutozipanomiboxejobose.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2e860232---81886422198.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8251ce506e64e4a76945be8f71de1035/34730843697.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/gakusuvinavekixedomubo.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/72817896922.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210616_4EA06D887FACF97B.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/87448335081.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/38123897069.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c2c63a2259c288cf75844c995467fa94/20878741797.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46fc3888a---powijufaropozexemu.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/mawiminadusafujowamaregow.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/78249810275.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3a3862f6---xopebuvo.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/nemokoduxatodifazebejasep.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/55627964628.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/37512865962.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611c820ec674b---fenelunav.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//60049764524.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ab6f0cb0f5af84f5ac00492a66a610f1/kefer.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f2adc22c32169d399ff1ee38f5a80834/47193776684.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3d4gf096qpqigrmcpdf12rqhg5/63652835066.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160811996981de---gusirosovevugudigubefopu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gidijozomita.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/tivazoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+radiestesia+medicaPDF 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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 10368 bytes
SHA-256: 86d34da09fc8ed93c25a41276c26dad7c1cdb1b21b82a4879dc6940d046a2474
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 18480 bytes
SHA-256: b2e3fcbd69671a57afd75ec7eea63b5bca304fabeee84498ddff6f263b110a51

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