Malicious PDF — malware analysis report

Static analysis result for SHA-256 7734afb6b66dc4a5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 02:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2f007fbf37cc66e3ffac6053eba5e114 SHA-1: aa6f7cff70f2cb2ba04d291377e1805ff78d4349 SHA-256: 7734afb6b66dc4a561d07ed16495f16a14b2b4e45022686ea6b2564edbae1beb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://phoenixturkey.com/upload/ckfinder/files/53077965945.pdf In PDF document text
    • http://twinmd.ru/userfiles/file/36731578532.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/wakezirukeze.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/34099150855.pdfIn PDF document text
    • http://njchemland.com/upload/files/30181309670.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/fosekumodiba.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137832667ebd---32640045751.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/peretunolive.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/taromaporovujezixoxo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c362d4dbca3eefbc65ff37c7414d7e9/39990553470.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5750035455.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/89049234984.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/73765756925.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/dazugag.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/saxelosapukinapitib.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109090418099664.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/401ffa4562c49b734579ab9cf5ee73c7/ninupegijopipaxige.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/97827871774.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133142d61347---87824581612.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/94038266014.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/27405101221.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/fafibafixovesabumatevogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=density+of+hard+rubberPDF 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 10760 bytes
SHA-256: e1859672fd7d42002ea4e9ad40c1afa9b97db3d57e33ef61f8543a299975820e
font_01_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 17996 bytes
SHA-256: cf93401e1c8cb312be2a1dfdb776a51a69b08b71f352c689f8973be5c39ddfb7
font_02_sfnt_off00012d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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