Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f82fc2c216815e3…

MALICIOUS

PDF

98.0 KB Created: 2021-07-30 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 379168d31e18d09ded91b2ec2df08b5c SHA-1: 5adf4cebeacc2070c6f609f5d703cb4430fd8bb4 SHA-256: 7f82fc2c216815e35eb2b5bf2c0beb1a322e0e51c40944909e22b26744c064ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The sample leverages compromised CMS upload storage and disposable hosting, common tactics for distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee88b364337---87562827305.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/60631234693.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/74044897886.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/nakufumo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/gutemobetagufit.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/dbud9j6cmk0oamd1rpdfqqu2il/26090530063.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62bfa6a2f---ketazebokenekilevovavotu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zuvavejebagazekomixowop.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c113ef981---nakager.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/30936biml21g52mpvpb7quais0/babujefuvekefeje.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/36455999409.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/20454203798.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/zifedezavujomutufe.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/vejewagizimakip.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdebd337166---1887210762.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a10b8f52ab83bb6388d120a6c6ad8c29/15328722461.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/94i4742n8j6j7evlcdrh4khh6p/nusugos.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d45a71e096c21f9da54a1f1868843f7a/87792793080.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5effe7970---9242905089.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b43bd45f---13429483586.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/siwizekuvumikezos.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pixokuwup.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/tofuriluwufofunofowutu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/42a37404b5b64271b61c6111c29dd233/59312238660.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/93038086550.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nizovejedaputup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=atividades+sobre+hiper%C3%B4nimos+e+hip%C3%B4nimos+com+gabaritoPDF 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_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 20356 bytes
SHA-256: b40ca64fe774dc2711e08a553d5c78110b0e75263d5ec6c71336eada6e39b36e
font_01_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 11248 bytes
SHA-256: 30441a14f0d59cce433f2d485e35fdf58b8d4af4298235d629bb7477e0775463
font_02_sfnt_off00015d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1