Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece024a4505843df…

MALICIOUS

PDF

84.4 KB Created: 2021-08-31 19:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26ec5fdb56927487115930896392d908 SHA-1: 320a11674499436ac7163d9597c96ccd03b1c3cf SHA-256: ece024a4505843df9720f1a20fd4bfacd7a04846a0a523636aef07447b7765ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to host malicious content or redirect users to exploit kits.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4b60ac3a0d3d440668dd8086a2cbddf7/gosoduvalurukov.pdf In PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/gixuga.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/dazefapopirawesu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/mololivalagorevogo.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/95873606027.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xupanuxanimoxugedeguma.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca3adf267---69406416617.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/da8aaca6b2eb7e56bcd10c8ab948cb68/61404896778.pdfIn PDF document text
    • https://mashura.co/userfiles/files/taxefopewibabufukuru.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/97104311533.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/gotewixuvavesi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/ravekofurufijiwulitites.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210613035219.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae4260f22---dokusajo.pdfPDF link annotation
    • http://churchtextile.com/userfiles/file/23922663812.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/ninasewesurixolaji.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/14229496053.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/wagonunumu.pdfIn PDF document text
    • https://davnosti.ru/upload/pivilom.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/sobomerus.pdfIn PDF document text
    • https://castel.ro/userfiles/file/pozaren.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe0d0ee04---88334953412.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/80700936001.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34106b1554---gidinidesefijuzufinelef.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5kf9ruptmn0e3f9bb0tqfor0f4/64640712995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=comprehensive+psychoeducational+evaluationPDF 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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 11092 bytes
SHA-256: d74fccd2b1c992f2f899dc2e1803184f8948960320f544cf76352d6cba5d69e0
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 17448 bytes
SHA-256: 2051f2c15e9de0b58d028ffa54d7a8ef895d35fa46542453ac612aff43b1251c
font_02_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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