Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f4424d8e4c408…

MALICIOUS

PDF

91.8 KB Created: 2021-07-03 11:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c2beb8b31b2c80049b674bce158952f7 SHA-1: efff6a28ea8f7ac4075f976f897fda533b1d9f6e SHA-256: 886f4424d8e4c4083d515d4bace5cd64f8bb5017b18fe0cf7bcd840f63a431d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs and link farm structure suggest an attempt to lure users to external malicious sites, likely as a first stage of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://almoheetmanpower.com/public_html/userfiles/file/wetirewur.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/file/62689500970.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vofesonogakaz.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/884f1e0c54d969b2c42b1d91c2358b13/mixufiragubomopi.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/petenevesoladituzexosifiw.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1433b955b80f4957e1f75866827a9acf/61231483149.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec46625783---mejejususetem.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd5520cd8---27408848167.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713ba0a3e12---ranudodupelinibunaxo.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/50740556945.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kemenizi.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jesolekajakupero.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de89bc693---32923454354.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3466cc0345---81284484679.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc8e93391---45404687714.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/926d5c2f343febf634017441a9409a48/31047924530.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/82890418509.pdfIn PDF document text
    • http://domplus.su/userfiles/files/bokorax.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/43417412480.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/wixupof.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/tawol.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7166627df78652bd6e02d2e4efe05f6b/58449531661.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3185c9e8a---tomerofusilarepoxudefe.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ebe81df7e---zuborokogezukarukena.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lisukuvetigitolovewafetur.pdfIn PDF document text
    • http://gyobel.itpublic/file/fozivakokerixefovisabus.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa065131d0e---38758171990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=functions+of+the+operating+system+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_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 11212 bytes
SHA-256: 6c9c3bb679a8b61755a68588862fb4447ef0af9d85ca2a635645d76a678507d0
font_01_sfnt_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 17788 bytes
SHA-256: 06abd81a24f575b0c07771a956777baaded5d66214e100a4c8995ea450faefaa
font_02_sfnt_off0001499d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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