Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa773759b280b4a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 08:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fabdb9e6355b3c901be6b9376d8612a SHA-1: 56536b074f654a3bd7e618c48ac3c7767ca19fed SHA-256: 7aa773759b280b4a0f370da62aa1e024c1914e326a6685199550dbdd84d66d47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. 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 0.9840

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://pixomot.ru/uplcv?utm_term=site+blocker+apk PDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/luvubuxikafodo.pdfIn PDF document text
    • http://93564497.com/userfiles/21523087722.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/punitutiworuwubiwipiju.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/52670991237.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vezuxebowage.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/806c2950fb2fd20cacb5762fbfc22fdc/kewabajixewajabopip.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/perawug.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/wizisavaligam.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0a445f0f---1845135995.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/79466273792.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/10db7b54d054b5e9d84a0369230e6b75/80198996008.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351231b6e50---93582011383.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/68250641176.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161360f9bc0dca---zerenupinaxix.pdfIn PDF document text
    • http://gzwep.com/img/file/2021910124359.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vku51dc3o320fmdg7qs0hhhclc/woganitekajasizojabipop.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/saxizalisizumakozofanuwuj.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/81034426307.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/xavobagopobubera.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likufigimib.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/sopeda.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/66969609510.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nq6o22h6jg0hjto831btsggup9/wovajenasodaxariradarop.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/siwisefoponitufafusuva.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/legonewimevunureg.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/gurudul.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_off0000b92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 10404 bytes
SHA-256: 3b8a55de0347c1890a60596d188c4a611aecb0a245fe027cfe80c420bc04b0d0
font_02_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16228 bytes
SHA-256: 7748230db930f7cba532617860f2b2df68c1e254ea88d7b87d0ced2ed3fab8ba

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