Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d133dea8d7ea01e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 01:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1655d05cdc0d0409d1a3a988f803350a SHA-1: 3cdda419aba559697f0faef00d7dbfa1477f033c SHA-256: 6d133dea8d7ea01e1176ce2c524f46a3ed2a4c79dc475bf1265d732daeb73abb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress uploads and disposable hosting domains, suggesting it functions as a lure to download further malicious content. The presence of a link farm on compromised infrastructure strongly implies a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://proia.bg/userfiles/file/guwojozusotizagetafufuxe.pdf In PDF document text
    • https://dnm.tw/uploads/files/202109150905444567.pdfIn PDF document text
    • https://esz.jp/img/editor/files/wagofuvi.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/sisuxovidu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/48258893484.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/k1uk5uu22fcd0jq4s7f5gohhmn/dajomikisaxazal.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/85deb40f8d51b96d9581d776cb63557f/xegigenejuzojewomiluvi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/13241612422.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e257d4608---vetevulukusawoleto.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a4430c61---18973603980.pdfIn PDF document text
    • http://dalaichau.com/files/26485183183.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/putugudixow.pdfIn PDF document text
    • http://ciskmv.com/css/file/wedafiwiwad.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/fojikamudu.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/nipezukilakuvenofe.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613941fbf2fa8---kutapamemavusifajowijare.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/dipuzutivolajudosezukukeg.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/82913745599.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/defirudafenudogasexuti.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/lofugepulubosax.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/83919684585.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/76dbf651d6d40fec8490bfc79475c987/wadetanefatubizibuxu.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/15137730281.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/2364546484.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/dojetilotoxemom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+best+ip+camera+app+for+androidPDF 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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 17800 bytes
SHA-256: 1af502ea9561a092545481b26666f7d4581f227d65528cc6a2bb6105ff823b16
font_01_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 10972 bytes
SHA-256: 6fdcbd042c4b4eb39f964cff8614b715f68d9d671f48b85df89773ad91a9416a
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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