Malicious PDF — malware analysis report

Static analysis result for SHA-256 51663b0419dbacac…

MALICIOUS

PDF

69.6 KB Created: 2021-09-12 13:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e6a051f78d9c6a302dbefdbd4221da9 SHA-1: a51126c3e21eea16b0b1d56f2d419307354aee39 SHA-256: 51663b0419dbacac24f09c003a51f06e6041da4d4b4d984c549a026edc0ebb58
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, intended to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.hydro-tg.pro/upload/file/58822125096.pdf In PDF document text
    • https://petpetmates.com/files/editor/file/64203610241.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/67812661476.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4b1938fc---xuvasepiremaginob.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://adikkedua.com/contents/files/12303519893.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/35174193505.pdfIn PDF document text
    • https://tessuno.com/upload/files/6131adc467a0e.pdfIn PDF document text
    • https://digireg.es/upload/92205660394.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/47219494654.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f2138612---tekenezo.pdfIn PDF document text
    • http://dgkno.cn/upload/givapugaxetosorab.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/25197143129.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/31014090338.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/dovaribarunokevipisavomuz.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/joduxizepedovo.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/laxefikuzajasuka.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/74001268958.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf931ca20---zepuvexuzevasarizegigim.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/kusituzikunodeferuna.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210912160225.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/35049011385.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de7c6132f---paroto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kindle+fire+7+custom+romPDF 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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 10616 bytes
SHA-256: 13436641d1b6138a4650ed43c2d3c3ff97bdf4de8dd3862afbd9496f8c7c276c
font_01_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 15432 bytes
SHA-256: 3cec79b471f04420c66262083414a4a5a58abc5f20e8d94d933b62109f97deca

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