Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d8a69952ebc664…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 00:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e6278efd414f2b1445cf751738b55ad SHA-1: 3d91458467328917d7eaa4581d23bcd41c4d584d SHA-256: e0d8a69952ebc664a38e7b034326f14e242fe9d8a13c2bfb2ba65d97e2657fb5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

This PDF document was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection scheme. The presence of 'SE_REMOTE_SUPPORT_LURE' and 'SE_CALLBACK_LURE' heuristics indicates the document likely attempts to trick the user into installing remote support tools or calling a fraudulent phone number, consistent with tech support scams or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=android+as+second+screen+windows PDF link annotation
    • http://cochemical.com/upload/files/pojejurijixiros.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/24293680453.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbdcc4d1f---sitowuregumupude.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/52282295232.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/34099651275.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/mumakukezil.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/96639320481.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe61333f0---72209097325.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/tasuduwumalotutifemi.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/20263793498.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/33868190247.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/dofuwol.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/binawigoxarumagovosevuza.pdfIn PDF document text
    • http://webbuilders.com/files/file/xuwemafarimobuz.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/zewabakiru.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_083602.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030841234009.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa0d97bcd56bc843cb241866863f9394/23938042799.pdfIn PDF document text
    • http://15881588.com/ckupload/files/9423430926.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/23665414887.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/39761063064.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/benefonavejo.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/bovulijojonuxur.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/84066892164.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/pifutitozimibivup.pdfIn PDF document text
    • 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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 19600 bytes
SHA-256: a7de87093ab4f33302fc8080b93cbda02ec21ee12666951ffaaca9376a775a69
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 10284 bytes
SHA-256: aeccb8a7dc1d7539e18f50b69263ba7aed4bb1ea97e45edcb21d2e492d107fab

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