Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ec52c369b88685…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 23:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f50196f3d4db5f7ab9931325d12ecb6 SHA-1: 51da73b17a3c096829696253e427f7d36cfef73d SHA-256: 81ec52c369b8868533f139d68e6c775424b55a6b0c62c7d4e5334ea9a3287f7e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links suggest it's designed to lure users to malicious sites, likely as a first stage in a broader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=3rd+grant+for+self+employed PDF link annotation
    • http://neoneophytou.com/ckfinder/userfiles/files/mawetotegomo.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/97282443298.pdfIn PDF document text
    • https://halead.com/uploadfile/1632089369.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/lanakemoregek.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/mizamibasiritu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimuxudunuvetizinopurunet.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/bojogibor.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/pekumezaw.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zawinodiv.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/94122570223.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b9c04c586f6ce0a7f7b6cc39e267b672/gupune.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614013ede2d2a---xazugepofiris.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/zabigevo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96afc72a2---43949308604.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/85833833728.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/37491953651.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kfuko3dj0a31r8f88j14d30foe/80521925775.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/17229290131.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/vosulabugulava.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/17935318714.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fubeneg.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/678a506d565df338e707371c852c312d/xemaj.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/dugakiwipiwemejox.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pemubele.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_off0000aff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 14540 bytes
SHA-256: d7c7c712494d52c8ed7cedb7a2f32f1a697580bb01bbe695e74c59d4a967425a
font_01_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10936 bytes
SHA-256: 38cdc555084a751429993a37c8496845eac0d90c7298e707f8865357396e6e4c

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