Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aee6769e2ce0bbf…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 23:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aab1abf036a83004e5036363a9779ddd SHA-1: 6fac19e16fc2ab1633790d8348be531c63f0d3c9 SHA-256: 5aee6769e2ce0bbf53a85f0eca5d698d8236706eca5685d8e0845fddf9b7aefc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.valathors.com/ckfinder/userfiles/files/51557611438.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/79914198388.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/dodul.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4f492a3614458f16ab05a5d987edda1/tusefuvubuzediwuzomavaga.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/jesoz.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/laluxudularotefawogi.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/mizosopufabupifupojomelo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/62163233174.pdfIn PDF document text
    • https://tessuno.com/upload/files/61353b932f095.pdfIn PDF document text
    • http://puisan.ru/uploads/file/bibivuxefapiluwijosul.pdfIn PDF document text
    • https://fasleh.net/Files/files/vatelikitavuxobuz.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/56392132008.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/31943352544.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/8934628113.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j8khknj7aqbpp4bqe3ei72s25a/gavobozejubeze.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/lurusizapufotidut.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/34005863699.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/metikikunotipuwimixezotep.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/gugorinusumokekagi.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mujoxezokutelagovawovose.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15cbb50---xiriwoxobiruged.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/36349694738.pdfIn PDF document text
    • http://brlairport.com/images/file/93345500757.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/tozifovifimuxemepaleja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=monster+legends+hack+tool+for+androidPDF 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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 10840 bytes
SHA-256: bbf847706449fd97da671bb01455a08b286afd2efbc85b2151aff0ce23494c92
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 19328 bytes
SHA-256: 680afaaea6bf2f70c4598b7b0afcde039be6c8f792a59cc3a0964a7490d9375d
font_02_sfnt_off00012f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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