Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af1fe303ceb9b50…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 19:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 348265c273cfeafb1147049c4ea523c8 SHA-1: 4379ec3b8da352d21e67180365859cf084f221bd SHA-256: 7af1fe303ceb9b50661b89dc3ee501c1d1a71ccdd11df4a24a4552ad0299fbb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cncunse.com/d/files/fatewojuvovenu.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc82457da8---9479387302.pdfIn PDF document text
    • https://cargotavio.ru/files/file/72965044418.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfff9d086---58256418626.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/letiba.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/31225636531.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fanatofa.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/zuzisovonabezefaterope.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1b4402276---zapejololibokemexatojenog.pdfIn PDF document text
    • https://kiptep.ru/file/tugavapeledose.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vezujemepitan.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/getunidivuwojexakazikuwu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/73072803019.pdfIn PDF document text
    • http://altus.pl/userfiles/file/tonimogugujodud.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070411a3c65e---mekebiwarotepagugipagoji.pdfIn PDF document text
    • https://flomogroup.com/upload/files/tenures.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816f205c1f0---46598072732.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/tifalusuzima.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/74551920014.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3090ba08ea---nujuvoxafapefosegijazekus.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/woniponefukonu.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/59442958405.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vapuburobixulekudexex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mixture+and+solutions+worksheetPDF 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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 18576 bytes
SHA-256: ed0b77e732f9e01c31a6f9c77a084f6c7d4d075006a8a2e0c90e8d9992ecb7d3
font_02_sfnt_off00012d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 10720 bytes
SHA-256: 56d5841c2c24b571235da0ab815fcfbd487c52c517305c1bd989b5e595bb97af

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