Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea3f54a0ead7c5c…

MALICIOUS

PDF

90.2 KB Created: 2021-08-15 23:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efbb3ea793be56656200f096faec5e3e SHA-1: 003f563e2c4b1a0ce9cd7861857fb4b5916faee9 SHA-256: 6ea3f54a0ead7c5cb634a09c3690748bec9a707558d5dc2e57cce71efeaacd00
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier's high confidence score and the specific ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yesilkoyluleriz.biz/resimler/files/xakefusumemogapa.pdf In PDF document text
    • http://tehpromyar.ru/media/file/76166608997.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/48030324569.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/65938403602.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86038d86cf---setobefopanopivujef.pdfIn PDF document text
    • http://www.polni.si/Images/files/75128169624.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/54048184957.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/87387265493.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/89429655002.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/32724711362.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/rutaxuju.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b8ed29956---23572213276.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/rejutizo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef9810934---83870841017.pdfIn PDF document text
    • http://denge.aero/upload/files/25314041401.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/gawepizogipulemek.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s9cjsv68lhivvr6i4kk4o5kv2s/23143811202.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/24nf99i9c0pqta7rfjtui5ktpb/zodagiju.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec79c43224---xewubulixerawokokalu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e1369671a8e9d0cf8d0fba55f8f6779f/batapifug.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dilowikepije.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4b8c4f93781aa07c24e779ce4339ec94/83269431802.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/39776058540.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/55129899600.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc43677f2---67889878067.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/l60mfbn5kqohrrodvm72jn62en/vigurigoruk.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7b41be60---54976245782.pdfIn PDF document text
    • http://pk.mo/userfiles/file/35759050663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sony+vaio+e+series+boot+option+keyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 10688 bytes
SHA-256: eb0378d1c503ccb51e4fd5f429a947a68619c728f7e23c52fd6f7bfc5d20e3a1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 17296 bytes
SHA-256: 95cf80cbce53cb9fc04bb92b2d2eee94701860253e3c2a61665ea5980cea4abf
font_04_sfnt_off000151e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E9 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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