Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f0017eded42d23…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 16:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1d0628a12f397e6cf4eecceb159c87a SHA-1: d9b5ae605376485df0e52384c4f272f82d5fc37f SHA-256: a2f0017eded42d2394178a6a50e4d79fe8499c523b75eadf9ef7b3b23dbe828c
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple links to external resources. The PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate that the sample is designed to host a link farm, likely to distribute further malicious content. The embedded JavaScript and the ML_NYX_PDF_MALICIOUS classification strongly suggest malicious intent, with ClamAV confirming it as a phishing trojan.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://fuerst-architects.com/uploads/file/30346196215.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/13307002515.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/2169890812.pdfIn PDF document text
    • http://iucecb.com/files/file/pokudovadudononus.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/447959162.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/sigujawitowaxovugugew.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/jusenekoropixef.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/8755196632.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kowoka.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/zuxiwefediguruxurap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fe0c172ac---43115822225.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/demifotital.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/84884291095.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/kekivelirikinejiju.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/29479457210.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e7cd6fba---63399420552.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/44489618522.pdfIn PDF document text
    • http://napiarsaigh.com/images/35251907841.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jevogejesofe.pdfIn PDF document text
    • https://majubesar.org/contents/files/21882605793.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nipanakekogup.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388c7a60e21---susebaf.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/ligikerowuxal.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109051826321140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cinema+hd+movies+apkPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/25540795072.pdfIn PDF document text
    • 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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 19080 bytes
SHA-256: bb4a7c6281ef01feb7dcd931588a4fe622073c3db90f146ba681e2849581eb66
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 10600 bytes
SHA-256: 6fb0f944dea269868438b50c8a84e5159ff90c386368d47bab95e538f6cf43a9

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