Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7ca935bb17826b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 02:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d3dc2dec0d671a2eaaa7173c2f3b090 SHA-1: babe66bd1b2b19548351ca868935a9fa3a415c6c SHA-256: 3f7ca935bb17826bae2aa282fe3305a458d1bebd08dc38fe4882fddbf0ae54e1
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 is likely a phishing or trojan delivery mechanism. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://sabagdasarov.ru/upload/file/favigu.pdf In PDF document text
    • http://broadgatecapital.com/userfiles/file/42216573541.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ed2n46jbqr8a8jg361kdmtiac3/zizeduwikirejuburo.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/nudidoparefutubu.pdfIn PDF document text
    • http://robbes.nl/media/files/zusoguvikiwusug.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/lavazuwimutepaji.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/78255077277.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9f2411523ac6f9784342f8f510b86d2f/fogujibemibu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7csc8h74bihpjnsobqdnk6lh03/pupakoduzalaranewobokiv.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/969e14ec867d1c524fc0699e8e88e07f/35006731297.pdfIn PDF document text
    • https://haidangpc.com/contents/files/36395027679.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nmv26fkc52kr376vdafmiko2ug/pobefadef.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rjmohavjm3nejsnu8ja7ploua1/30966782878.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/12370598042.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/98322981673.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/76070307236.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/foxevopudege.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/88217091483.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/majofidijijogekexuxal.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/dadexurobaduvigodesi.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/69876428607.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/dixiliferowogedezutode.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733ae1ca47d---senejewavugukurugifakuz.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7a830e1322f79469dacb6eb42dfbf46a/kosomusebapimirotiwidopub.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/82452126673.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d85532e92---fumovozolatafisudej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+conversaciones+en+ingles+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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 19924 bytes
SHA-256: 7cb1b1d4ddf94ee736314b1225e76bc6bb76b78d285971072d4aafa4f387d57d
font_02_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 10764 bytes
SHA-256: 0e2b32f92bdfab9dfc6f5b00a24512196fecd1c2aabd227d3bc024f3040052e1

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