Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c97b2827c421482…

MALICIOUS

PDF

110.5 KB Created: 2021-06-26 23:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 708ecad30885d5fc1ac2e503f37635d8 SHA-1: 8d5ae0439c4e1ae89dc17427a5decd24c7ed7c00 SHA-256: 9c97b2827c4214828a1036f0d251a82aebc26fafd58c901875f75a0aea235467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious PDFs indicates a clear intent to deceive or infect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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 https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/97m1voevja30tvhukisq3b5hvc/lurufisemokidezowarazot.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b691ee441---tutomupipakajozetu.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/gasurezotufazodevow.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2675cb67b---fodabowokelo.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/14428067852.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8a99c8a6---xudejozaxewux.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/44650230871.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/sejakirovejudisibax.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c31983d8b---xonalaxo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/045e304f1d825979d7cec9e9803596cc/xoginifepixawenokudutu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/90741618785.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160878606b5963---kuzosufojomawobifom.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/sijalavexozafixuzenone.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4738e342---68162031084.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/lijilexetefemoluvepos.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/legipibaxur.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f600303f34---84942339767.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/78385721570.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gefuvan.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mdok70f352ksh2ph9ep6tgq5u6/fekema.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b60bc4d999c---43714581473.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608417407d4cd---lolome.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf874e1b57a---sebuzenaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hypostasis+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014804.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14804 16704 bytes
SHA-256: 8fc70cf25c737aa32b0ed6b816cd9ef66c44a5a1d3359eb7f82470c24081d372
font_00_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10704 bytes
SHA-256: 25b8f6932351d19d72041e4fd91465f3c86f87a93171e75ffb2eeb291095ed02
font_01_sfnt_off00013bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD8 2908 bytes
SHA-256: 492580d7d608dbd141e7bef91ab51b09a12ca1e7e6065e55daa6e78a9e8c3073
font_03_sfnt_off00015fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000177ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177CE 20744 bytes
SHA-256: c1ae0ad3ab35a96032ea3f0250f4e37dbe3a3890d5ab7165c5c61798d8c67d43

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