Malicious PDF — malware analysis report

Static analysis result for SHA-256 921ab96e3fcf304a…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 06:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e70e872893285eac60f58a8ff8d29f2d SHA-1: c197e9f05048a4ed8665b9828a75c73c9d1fcc6c SHA-256: 921ab96e3fcf304a0cc53a75e6c4fe3b100db05c98d867ab6d425830a2367174
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting the PDF is part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://uleshuzataruhaz.hu/files/file/loboletatazinovog.pdf In PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/ninojo.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/mekirukusoguv.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/53335425916.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/vakosuzivipebilupe.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wonutuverikur.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/falowefimozanexamekogup.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/takepasijexapesamekuxobi.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/72022774586.pdfIn PDF document text
    • http://gaudi.tw/upload/file/85846570498.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/24097227392.pdfIn PDF document text
    • http://landpas.pl/upload/file/rafafumazegufanezekivem.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jobixufubavepovosero.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/dosilif.pdfIn PDF document text
    • https://onlinendttraining.com/files/18740765686.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f196253829---budobikovugapa.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/95962859917.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/majulumitiwevulubum.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/1033464783.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/51080344767.pdfIn PDF document text
    • http://ge-mak.com/files/96208304263.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q08qbb8evqgshj3jfuv2llaiqf/bilewozesawituniva.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/inbhmjam4f02nh4tdu5cpaho7p/39547404936.pdfIn PDF document text
    • http://hkalc.com/userfiles/wenixenikikekawamineka.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e121cd4ddb---48109010525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+best+fever+reducerPDF 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 17636 bytes
SHA-256: 5f70f89a23462ff8443f2a56a6b5729beb80b370e523e1f5ffb65607a38b35d0
font_01_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10604 bytes
SHA-256: 3093d826762f5096ce5cc87a99574791938aa3801811ef5e05b486c6b12ab182
font_02_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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