Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e78ce5f6afe29fc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 09:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9594e831434a7170d5c66479674fb31f SHA-1: f1a4ae2dd07648c7da5dfe086c6d5044017c92cc SHA-256: 5e78ce5f6afe29fc3c56a64c803bfc79fb99c527fd29482782393c2a51f0ce75
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. The document also features a large number of external links, many hosted on potentially compromised or disposable domains, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zeroseistudio.eu/userfiles/files/99391205713.pdf
    • http://ahkjt.com/upfile/file/50042127236.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4241cdb6ab9e99ed8e3220b129421a7c/ribotaxat.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/45934368780.pdf
    • https://cs168.tw/upfiles/editor/files/lajosewuvifomebaxotubum.pdf
    • https://beauty-full.ru/uploads/files/11893288360.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/47485619057.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m8sqthm70aun29olld7nuk7644/zefeweb.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/aea9dc4374515b80bbd0a576dc0fe4e0/4955581916.pdf
    • http://dekobonner.de/userfiles/file/70793396026.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/julufimudexadikim.pdf
    • https://fonixkoncert.hu/upload/file/56615478718.pdf
    • http://docando.es/js/ckfinder/userfiles/files/dosuvufisosujavilibifow.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/64099565372.pdf
    • https://sieuviet.net/webroot/img/files/64388860540.pdf
    • http://akademibt.com/resimler/files/92165626822.pdf
    • http://amadpich.com/userfiles/file/45284740294.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40660952687.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ed7v37m0j229s1thqsh4ghoamv/farijirevosubuvaneve.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/xatevo.pdf
    • http://www.klimavill.com//data/editorfile/99575099297.pdf
    • http://www.pattyn360.com/upload/forum/files/93486944139.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/71622012029.pdf
    • http://studiobaldizzone.com/userfiles/files/85597858858.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sirope+de+agave+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_off0000c2f3.bin
ee2d4b2266c4e20f63bf8aa9f654c72edb1d43063cf48bbc9ebd0ea84519ddcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 17820 bytes
font_01_sfnt_off0000f135.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
font_02_sfnt_off0001094c.bin
2cc785108cfb8e9eff370b846ca781fd8cda894922a05608e6acff6a12c5c6e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 10396 bytes