Malicious PDF — malware analysis report

Static analysis result for SHA-256 79667b47311007c0…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 16:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 304dd9576f68250c527f0650158c6818 SHA-1: b16162732b534bd21777182f2250916a4f7c193f SHA-256: 79667b47311007c0bf853239cfaf0b3703b58e2a70bc19d9e1e48558157faf99
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=trials+of+apollo+pdf+2 PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab46446c7---85634945611.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160accce131d97---49132897818.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f415ec525ea6495e08b6f11eb81b78df/rusukobuloduwunexo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160744b8e10e5e---tonejugutin.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vk3tqhhbif5qagq86kt9g9voi3/tepewijarudinuru.pdfIn PDF document text
    • https://stotex.rs/files/tofiwagaxubom.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fdb449e91---dugakujubezuluritokogovit.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/14ed11a5d6436573de80f6f4c27992bc/nimap.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8n8fuajh3ap483a553ul36r9gc/kunijuzixiwik.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/bivodadowubonolojojadid.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/kuwetoz.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/240fd7351cc54bf20906e2ddad1e4872/poxekusur.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///judozemosokegegisulixeja.pdfIn PDF document text
    • http://drticket.ir/basefile/drtiketcom/files/velinirolemapuwezepuni.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/getusinulutikosanikezim.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160768b1b922b8---lebojediraso.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161027bc28d64e---medolamumiz.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85bdd1a3c---tojinuxexunenagudexibir.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/3578626734.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/15424106280.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6337ae30---zukej.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tatenaposonewusokuvikowij.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/xokenedifimasisepupo.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/8458771510.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_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 17900 bytes
SHA-256: 5c0d643634f4c224ed71862b02d143d761469fbb7484f4ba073441ca15930a5a
font_01_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10240 bytes
SHA-256: 3dd15966f81eba21beff0fd499301fc693f5875006d7f6db483381e1a2212183
font_02_sfnt_off00013af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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