Malicious PDF — malware analysis report

Static analysis result for SHA-256 201803ba3580d1e9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 22:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16c891082d387f9ffd455883fcb3a50a SHA-1: 8279893429571377dd4572cab0ec1a4de8df27b5 SHA-256: 201803ba3580d1e944490a6ecc76a485408abdd00e499617a1dd397007fa3d07
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=best+site+to+download+android+games+apk PDF link annotation
    • http://winkeleninzundert.nl/uploadimages/files/62862179994.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3d34bbf10d03b5244197acfb030297a1/86184417999.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/botulufu.pdfIn PDF document text
    • http://wych123.com/upload/files/68156361422.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/bumoma.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ahcl91b1gtb7t3huso7qaobua2/38098130533.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/zukemixomesaw.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/nebowenedi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lt5urnojn4et21enh4hivs7535/81200123071.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/26303437088.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62ce910b---fovokebetag.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/96339615223.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dofukof.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c53e6d46---tisifefinaninixute.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/10962559263.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/debev.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/17817237523.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/90309246336.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/8815996730.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/vagewarexitufolag.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/22365348663.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/mibazowajimalagobisopa.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/fidevukom.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 10968 bytes
SHA-256: c7ac22ac5745dc8c8cee3e701515b48a27b4c3f6a7a4f3c3a7dc4dba1e4506ee
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 17780 bytes
SHA-256: 765894fc032e05ba240303c56bd4b2f7e75e7bb10e204ebdfdc476b971765857

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