Malicious PDF — malware analysis report

Static analysis result for SHA-256 c858e62c688c0886…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 19:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7840271e69b70f718611c7e8f6e28c66 SHA-1: e3a86bc95bb11d062120f53a97072d90467b9f5f SHA-256: c858e62c688c088676c4a6a8bf45611d8887364e148affca2abff70a18e3659a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of an embedded JavaScript stream further supports the likelihood of malicious activity, potentially for downloading additional payloads or facilitating phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://realcomfort.ru/content/upload/file/gutemezitewum.pdf In PDF document text
    • http://salespate.com/userfiles/file/wavilumi.pdfIn PDF document text
    • http://merwepizza.com/upload/file/5734561236.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/jizeror.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614318d828818---73092898694.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tusiponubina.pdfIn PDF document text
    • http://proxima-design.cz/files/file/41326862831.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d7208d70---roruvuzolilozivipugu.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/forapev.pdfIn PDF document text
    • http://openkomm.yussfone-crm.com/userfiles/file/binivipuxar.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/84202582756.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/48077047787.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/ralasexebifawuwilikesegu.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/16384740404.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/vekal.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/bupugozupefejatin.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/807501524481630710556.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/32086652005.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/totateroneboxodivuloxobi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c47d07f58e491386f31ac71e01498ea1/japawuz.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/59053980018.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/59745660469.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/rupurozebimujatasodug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mortal+kombat+movie+ticketsPDF 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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 17940 bytes
SHA-256: af2e2c8846451803fe86902d94e0f63976dba861340eed18f1b7977a51477020
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 10580 bytes
SHA-256: 1df68815b6abfcd1161c4dbf2f71cf7eeb43fa6b6e5dbc260c410c1639c8b1ea
font_02_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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