Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8528f00a5e17dc1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 01:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c22ed884c6e3eba8c6550c7e137e4501 SHA-1: 1b7ee89af108e9e329950d10c4e71faf48d2c08f SHA-256: e8528f00a5e17dc13ee3ffcec00e397c0323614d6e41349db0aad7157e0d5aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=minecraft+bed+wars+hack PDF link annotation
    • http://kamkmori.cz/ckfinder/userfiles/files/wubebuvidadofokogivule.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/00aed13164a50287e418bcbca89cd396/88714728116.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f8971caed67b92e9a96057f2d80c207f/dosojav.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/ragupozogib.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/42594578517.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/50343145204.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/73287540791.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0832ecdc6---37634874243.pdfIn PDF document text
    • https://bem-sa.com/img/file/62644805340.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/kebemoronurigafaxulafegi.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/kefobudewapatu.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/37926375867.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/jisaremevumuxer.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3860765d3d75c701e1825f91b726863b/belom.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/toguja.pdfIn PDF document text
    • http://k1a.ru/images/files/file/78761514809.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/xowivakemazexatifileva.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/nilag.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wobimijatisejal.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/novulevu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/xugedexedikabewoti.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n1d38c19nc2ececvnhbktm6bao/67750501853.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/watig.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_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 10716 bytes
SHA-256: 5e15ed5949c52e7228271cedb57290700d83f74e26dffb6bd3e82ab289488a5b
font_01_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 16336 bytes
SHA-256: 8edbe64f618a5fae620500771284623cdbef1dc1e4302ae0402e96e965ce3fe1
font_02_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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