Malicious PDF — malware analysis report

Static analysis result for SHA-256 51004b5616cb5d2c…

MALICIOUS

PDF

123.8 KB Created: 2021-09-05 22:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d3878b53d6b4e0d38ff2ddca59e48c9 SHA-1: 842aa2b658f6b1f1b283346664258aa8590acfa5 SHA-256: 51004b5616cb5d2c5a83f6176e63ae9641e4aafc9d4ff1064b453ac2bb912b53
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware delivery vehicle. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm pattern strongly suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stellamaris.cz/userfiles/74356510676.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0b3ebd04---20660952890.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/vibukuteni.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/67056005854.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160718fad48297---43994663445.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/cfe5992b37eac006a72ccc1a34e29169/kokewifox.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/sb21v1r94l6oje6i7hjnsjdr4m/66949493110.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/95869329407.pdfIn PDF document text
    • https://keongracun.org/contents//files/4121508453.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xokalosowerebarapubedaka.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210825122952.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087283099363---80760140613.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gs97ts08cuegsaa1eqlcusqsrl/delegowaw.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gilupitexidadezusiwarav.pdfIn PDF document text
    • http://dalaichau.com/files/13448547417.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/bufixotikeluti.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/jaladepixijud.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/91331833738.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6e073130---xininukiwelemipepi.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/nepunifa.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bibinerisozewimuvodajajul.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a11873cd---84958138795.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/15712453775.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/padisafi.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/pulozujeparip.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/wemewujivakekoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=regional+dialect+in+sociolinguistics+pdfPDF 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_off000174d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF0 10840 bytes
SHA-256: 4e84f7ea7717e0eccd4cc2990641e3ef0bab4dca663d0b9df58d2bcb8012cc88
font_02_sfnt_off0001a5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5DD 22652 bytes
SHA-256: 7185a69e819831fedc167dfb665a280f050b5417192d416a0c0abf2fd2ea03c7

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