Malicious PDF — malware analysis report

Static analysis result for SHA-256 347d75793a0654f5…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 21:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1de3f969deaf7da551f5a20b664c810 SHA-1: b317369607b0fb0dbe44fbbec8fb6fe6b404b6ad SHA-256: 347d75793a0654f5f51de791eb81ffe151c60aa8833a4bc4b2c21d9d95207972
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://daqing-jewelry.com/uploads/files/202109150111051224.pdf In PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/68826294555.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e798c0f4f70980bd41bb942cc83a13bf/devafemipuxuvasuzokomew.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/mevodomejesesodijukum.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/19813678866.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tedemogagetisakekeduvi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lotekezunuvilikotowili.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/famunuloweditazusar.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/jasowatiw.pdfIn PDF document text
    • http://podarox.ru/public/files/51325593568.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c19f475c06a69db9bff0502ec140513d/tugajobaxokubifugepidavak.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/11350208632.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/rivukadopobugujusitoz.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/gupigudatoke.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/53859118077.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/92277223617.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/96807591472.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/66848527331.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tomekupilizoralu.pdfIn PDF document text
    • https://ip-pharma.net/data/files/jowujogetimikejisip.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/dugodesovegowufok.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/91296479275.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318b8382a59---xutinoxovagalono.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/sogidolunezemi.pdfIn PDF document text
    • https://dukupahit.com/contents/files/tosijajufediboti.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jebafigezugexinadepoza.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/97574a90cab79d2e651be4e9fd88ea44/182549412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bug+in+android+phonePDF 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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 10512 bytes
SHA-256: 587e46b1b4094ebba5efee1928a71adca5309a4648cf04a66e2396ba4117bb0b
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 17620 bytes
SHA-256: 59360df2570368f2fa52fc01537a361880860d2b05db6389b0bc4fd5d5b13738
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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