Malicious PDF — malware analysis report

Static analysis result for SHA-256 7481841e55796644…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 22:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc0e7f2358037bbed32c5d828f8d60f1 SHA-1: cc93444200e3ba14494c091d099422a294d3d05b SHA-256: 7481841e557966440f0faf3b859c82f5d8748f165a0d33bd7c75c5d345fcd589
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on disposable or compromised hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://akhsmombasa.com/clients/861898/File/konuxakikakikowugiteguje.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23c7868f7---22844886627.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16081f61617a20---80208907405.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/215244be30daad0869e43c2633ab93e6/letimepegejadamapogunewi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82fff5aa8e---90625709943.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160706ab24003c---soxarirupevaloxulap.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/raxeboleremiguwixewig.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/1a634d6dffb6d64616560117aee7ae24/63422097261.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/lumubejar.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed4059061---8197582434.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100d4c9ea9a3---14629827636.pdfIn PDF document text
    • https://menu2uplus.com/images/file/47527457771.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/lenikezuve.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743a0eba79---42378891417.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a763082ef9d---derebebamuxobakudufipew.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/71118832078.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/19576474031.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/nizinavesofimotep.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35e31bedab3926f1c900340daf8ae7b6/rorukasidaxefodelixufos.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/92988956933.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9bb62409---11175143411.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v4l9slg0fam117k00thcdluja9/ravoxexeroduwipa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8b6a406c8---43441914441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=libro+una+vida+sin+limites+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 10920 bytes
SHA-256: fb0b797c0716907568eb786a1ccdd2a57edfa1786bdff35aff69c3ca7ba75eda
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 18236 bytes
SHA-256: 4538630f8b1feea0081354af069da22fa039d5d515fc9a1781ad25bbe6ebe707
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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