Malicious PDF — malware analysis report

Static analysis result for SHA-256 925f7a1d05d2b356…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 13:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 375b6b4fa240aa555509e0cccf765166 SHA-1: 9cd9fdc54471a3ac4d72117dbea7bfdd60833d4b SHA-256: 925f7a1d05d2b3563e671c09da8611be7907bb3aca0b4c13c4b9a3ccd9d991cb
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to potentially compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings point to a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=android+speakerphone+always+on PDF link annotation
    • http://tencanpowder.com/d/files/18034427495.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/fajututonemokomunifuviki.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139eeeb5248b---nebifibovumelopiv.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/11061435781.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/xiziteperelonetozub.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/retugagoragipaxanop.pdfIn PDF document text
    • http://anindecor.pl/files/file/sukewesofajefopetas.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kepekokosekepunusiwo.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/72958508835.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/xanomej.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/jubitisixul.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/64892801175.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vfutr8o2h4qrnkd29lnhk44pop/gojetoturerov.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wesirajijuxurekof.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jemipusupinamotamujesi.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/72759085184.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4a67da26b15083efb9e6609971d02b22/44172006970.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/fadisinidezuxusiwiw.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/vonuduxanazibekeb.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/60532655516.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/nalexemupovikabalabiz.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/079f78d56f87d5ae8735a367a506f49f/fuxapovenasulokufubem.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/68481962023.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/vasuzotakejebofazitupadok.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/73658726788.pdfPDF link annotation
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/mijedanunawufirabazoduje.pdfIn PDF document text
    • 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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10664 bytes
SHA-256: 64c2a57d71fccfca9ba826c197ee36253ab9317fee04abe4d5ec9e6cb7b2552d
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 17092 bytes
SHA-256: 90bb4dbacdefe7a747109cb7d19ef0cd953c8211c3207f7e26cec815538d44f5

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