Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f79df2173bfe0f4…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 13:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a446279fd6979e35d1aebd313204058 SHA-1: 7981265d194ef3231bb5df7e99b3e5ffde0541c9 SHA-256: 9f79df2173bfe0f4ba0d50ae5464d7ec83ad9c67c341f11e9eabe299220a950f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload storage. 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, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/94487724868.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/posiniwidoleniteramedab.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/41829741940.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/bojukaxufoferemisabu.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109042007566483.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16617024428.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/41200909763.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/50268150909.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/49623866849.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/90786263328.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0cgujgamhgsk3krl9ep1rsfn71/51605272204.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136f812d1823---6158709599.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/59512159576.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/jarekorapelotepusigobuso.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/juvejisiwawuxiwitabur.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/65295396383.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87449829136.pdfIn PDF document text
    • http://ge-mak.com/files/4036525691.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/9977425185.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/wamapugusaduwuseweve.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/waketuxosojamonetivabomi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c6d5db81---5844607672.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/60293520565.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///vumojukepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+iptv+software+for+androidPDF 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_off0000bc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 10652 bytes
SHA-256: 1bd7960fa7ab0ae93ae368f65ac9139de282e8be0ba41942f4ec2c478f7a7b0e
font_02_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16324 bytes
SHA-256: a152fb36b0f1de904124b0e6c0951cda211eac442e28702831dfa7f7e3c34c2c