Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f5a7472849cd17…

MALICIOUS

PDF

80.4 KB Created: 2021-10-25 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3b77f2c68e71d70aaa658c502fbd17cc SHA-1: 70280412e2c8f4d660ea276465d84b762d08fba6 SHA-256: 51f5a7472849cd1784e66a9002eed7ceed1e5109ba7b722406a01853c61d074d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or potentially compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a spearphishing attachment designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bloc-immo.com/images/55896605036.pdf In PDF document text
    • http://lidaoxc.com/upload/files/42840450144.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/mafubovoxigolopazo.pdfIn PDF document text
    • http://rentaruedas.com/files/others/nifulowizovamiremufodimil.pdfIn PDF document text
    • https://airxps.com/userfiles/files/33454554316.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/99bd1b509ac14c6c9324dbf46cf0ee93/tewagosedepopit.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/sumaziximinopapaberem.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/xusawikili.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/ditidudo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/58174752790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616a7dfd5e420---95491144762.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/41935203194.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467276256a3---19261929413.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/92237603940.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20211025151650_840586519.pdfIn PDF document text
    • http://afslab.asia/upload/files/49799137139.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/3223995215.pdfIn PDF document text
    • https://iword.de/userfiles/file/95595617067.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/57524662987.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/buzeduxupubobevagemo.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rukezobixewiw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161589dc2bd755---61788871863.pdfIn PDF document text
    • https://msiutilities.net/documents/33126090572.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/balag.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=the+last+stand+of+the+new+york+institute+pdfPDF 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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16908 bytes
SHA-256: 14b2b03c85e6cf2afe69f14268adf0ae4da6c5d4f037c1f539ca8e6ab62099dc
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 10952 bytes
SHA-256: b971cb591eb99772ad15da2abcf9de106a5a6eb474078f7dd107dfd97766aed5

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