Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8fde8f4592ccd7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 05:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b13a7e48b7d30a342c0540ae3ee099f6 SHA-1: 8a5d957d7cada1475c529ba69306b1be6fc627fe SHA-256: 7c8fde8f4592ccd7ec8c49819238e28477ad096a18ceb4ec56035f3ade81f1d2
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious content hosted on compromised websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dgn8jci95qcrp4t98e9dvkmri2/nanojexakixojewugipi.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/pifutu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d5cbb23350562b521f91c2bc4a7652be/37969601546.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/96791935651.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e833ba99daa---bizatidek.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161188e679ddfd---linapopatufewaledavama.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/mitatan.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092e48164b76---levinogujibezawifonugu.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/50544904612.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/36282499273.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164330c0d8---9865888363.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wepipo.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/51162509515.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2611757ee5---fotikor.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f5cdce3f6d8ac05d2ca3e2f439637849/55814256583.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ced3f2b98072abd91e430f8d4840870/36366307722.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/72534214940.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089c61044fa---saxobekefilar.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/bonudozadosifevi.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/xebuxavuzoretexogojoji.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobewozutijifaxi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4109d654---jepawusowerafew.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/18567149910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=point+of+inflection+examples+pdfPDF 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_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 16504 bytes
SHA-256: 1744d0668c76add6921d1da64d6ad195f3a61cc32c48c294996418ae71d8b79a
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10784 bytes
SHA-256: 45ea484f07d7048792429b2ae64f7e700fd01adacd52ccb33645be41becc21e7

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