Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a185d621ece472…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 23:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5e311fdd06f0deb1ea5ca3d967dba0b SHA-1: 0f39d143e2aae5d263e5cba615b04ed9041e2587 SHA-256: 44a185d621ece47255af18fa87da005ef24506ec032cc5712530d61b67258e0b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pachetedeturism.ro/images/files/29108641035.pdf In PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/gibopovugapavumafe.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b061951f04---kijaninaxibinego.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/zigolupuwonizowizubugar.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161426ff403b01---baxikut.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nevejevemetitow.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/54559293216.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/lolewepatitajuf.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210917043031183.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/rawinifikibagipis.pdfIn PDF document text
    • http://ailizia.com/userfiles/vuzufavukiraguzisituw.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/wadusipagi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411984f3e59---57078753634.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/2578763569.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vurevipofolojiboduj.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/8197261190.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/11017353263.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce12269765---45785017584.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/32823696292.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/37408786381.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wujoka.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/19436891454.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/82726883108.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/solamitasevegu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3a90a099ec6c016823ea2b2e40c77a50/pekam.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tirunarim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+random+video+chat+app+for+pcPDF 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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 10960 bytes
SHA-256: b5f681e06e99e078e9ae8611098c4785c937c7926e9a86db8a85110940205d92
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 16684 bytes
SHA-256: 4294c769a96764add018c9dfa134f08294df38cd14e1e487202fb8e58f633746
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1