Malicious PDF — malware analysis report

Static analysis result for SHA-256 3885dbf862b9f9c8…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 20:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d620058db965e6f33dfa542037323f94 SHA-1: 2f9dc3e7824adfcfcdd902f7fbe64d5e3f8f87af SHA-256: 3885dbf862b9f9c8ba99892908757ed0094179802e1fe500fe2f5379d5302ca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://luyenthitoeic.info/userfiles/file/77367205202.pdf In PDF document text
    • http://salonorganica.ru/upload/files/zimimovokekipugoji.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mibid.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/rifar.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/18245251215.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623311066.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/litixivesikudugokis.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/46479468106.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/difizimodinufenew.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/joniliju.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/619812ec09439e5d608b045c65d74330/pivusumunijapodo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/736abab76c8e90298d5764182949993e/85365749018.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/6118138765.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210611133516_ciap3j.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7b100bcc---busipoveditaro.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fbbc03e1b---wimuvinarixizo.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/juwutetoterewofajekewuj.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/61233539128.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f926c33120---85719519628.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79tht0b3d52pam34ojogv23fm3/reralodutuvi.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/14625650302.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/galitozukofevutumev.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/dogatuxenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=example+of+sense+of+place+ap+human+geographyPDF 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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 11036 bytes
SHA-256: 55caf8ded46aab4de49febffa2262c690e159f45813c9a7bba40959db047bae9
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 16908 bytes
SHA-256: f004189fb38d6e39ee68c7d4ba92c914be46ed5299ecd277dbdf083efebc9db2

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