Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bb2def28c651c6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 07:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af683d65174566448f9a5d6ce62e0ff5 SHA-1: 82c8e48f307572ecffb1858f63720fcea4e2d95a SHA-256: b0bb2def28c651c63775f752c82fd4b56cf16015f8a574122ff2e4921b231cf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

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://synerhu.ru/uplcv?utm_term=verbs+used+in+cognitive+domain PDF link annotation
    • https://almuhja.ps/ckfinder/userfiles/files/supebejitisititozov.pdfIn PDF document text
    • http://unibox.lv/files/text/51864153017.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/42536726017.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/88df095fa6a0e1e7546852e0142142b7/sonevepinetabilazajenarod.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133207114bcd---16582841249.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/3441298624.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/42512612694.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/12515265027.pdfIn PDF document text
    • http://silver1979.com/upload/file/81626505306.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vazew.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/16188603145.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/dajiluxo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fca6cff1---mavaw.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/peludajulatewo.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/fuvixixe.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/53289282376.pdfIn PDF document text
    • https://artenika.pl/fck/file/36115830907.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/nuwinovovepokewapem.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1d310035---nagigabawej.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/77691955370.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/51673052539.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/tewumerekudaxaxakemefodu.pdfIn PDF document text
    • https://photofetimages.com/19952066100.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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 18244 bytes
SHA-256: eb338f97fcee62929d329ea39e585287d8a10293be915bb734af963b16f2cbe7
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10944 bytes
SHA-256: f0ed8d70cc9db50be0d9178a9b493c6364209e429288f54caf8aad5ca8a3483c
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1