Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68fc28261ae1d8e…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 00:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4970ff52fc74f7954ad1621896e3d78 SHA-1: de5f2c0e56ceabf002eb8829d35920c3315342c2 SHA-256: e68fc28261ae1d8e3471bc58c51d1939d7421dae63e355df909b93e607c410d1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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://varida-tech.com/ckfinder/userfiles/files/revanoravuwamote.pdf
    • https://endeligmandag.no/e-brev/data/div/rutawa.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uu64pr5f3v5b75s1g31ke87hob/41041665923.pdf
    • https://bhsbeacon.com/FCKeditor/file/vajafifusejeja.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/dulalekeziloxomanimupob.pdf
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/4816803669.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16089fd11202fd---35740807570.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/widogar.pdf
    • http://haokunchem.cn/upload/files/pipobuvut.pdf
    • http://tranhdaquydep.vn/upload/files/vomuvapudisogudixugejep.pdf
    • https://tenfci.org/userfiles/file/fufuwekalexu.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/81660423334.pdf
    • https://fl-forever.com/upfiles/editor/files/18567781328.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r6eff8pp1k4hc2psr79o64cn42/kiwuroviminexudugoxotikak.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/fadojoxekokelivipen.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/sanitaparezojopobiw.pdf
    • http://2ds-creations.fr/userfiles/file/44747675387.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d205693f972---xonemolazefeviwa.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c401b708e---34088829196.pdf
    • https://xistenze.com/files/files/14623935072.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/jeniwepexujamigipobevumap.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/zixarawemoribumofuditaseg.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bcblns22q4r4orb44pntuqir7p/bexuvatorirodak.pdf
    • https://metricgroup.it/uploads/file/4606742454.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tucpbrk7t9dlputrp77lkm1vse/mifabodajeludu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=candy+crush+saga+mod+apk+unlimited+money+download
    • 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_off0000e863.bin
71b51382069a5447b4e6df043c593cdad6a19c439b2ed2c5a22d46a3c1312b89
pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 11384 bytes
font_01_sfnt_off000102e6.bin
6bd39ca8c8c7e417584d0d372f63f6865a5ae6534135f3b7a89cb7df1058bec9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 16548 bytes
font_02_sfnt_off00012dbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 16792 bytes